If I can elaborate, for those interested: the light does not come from something burning, it comes from the extreme heating of the rock and the surface of the moon where it struck - there is so much kinetic energy that it heats it white-hot and vaporizes it, creating a huge cloud which then cools down and disappears very quickly.
On a very modest scale, you could demonstrate this heating (conversion of kinetic energy into thermal energy) at home: if you have a hammer and a ball of lead or other soft material, hit the ball with the hammer a bunch of times and it warms up. When the hammer hits the ball, most of the kinetic energy (of the moving hammer) is converted into thermal energy (to heat the ball). In theory, you could keep doing this until the ball was glowing red-hot, white-hot, etc.
03:30 "Is it safe to moonwalk? The middle of March might be a good time to stay inside." Now we only need some moon habitats that can resist meteors impacting at 56000 mph.
The impact actually will generate "ripples", in the sense that it will generate seismic waves that will spread out from the impact site... although nowhere near large enough to detect from orbit I imagine.
There's a useful concept for space suits called a "mechanical counterpressure suit" or "space activity suit" (article on Wiki). Basically, you don't need the entire body in a bag of air; as long as there's mechanical pressure pushing on the skin there won't be swelling or pooling of fluids. So the suit over most of the body could be, in theory, as thin as a thick elastic cloth. Cool idea but has some hurdles, such as how to get into something so tight, and it needs to be exactly custom-made.
When you hit nail with the hammer a few times it becomes hot. If you hit it strong enough it will glow from the temperature. That's because some of the kinetic energy of the impact changes into thermal energy. The rest of the energy goes into bouncing back the hammer of the anvil. In the case of moon and asteroid it's the same, but the velocity was much, much bigger, hence the temperature created was much bigger and that's why it flashed.
it's absolutely the friction of the impact. the impact speed was in the tens of thousands of miles per hour. most solids are vaporized at these energies.
Energy is released as electromagnetic radiation (what light is). Most of the time heat is released as infra red (which is what heat sensing cameras see) but when enough energy is produced visible light is emitted, like when metal glows red hot. Fire is just one example of something that produces enough energy to be seen.
I saw some stuff in the night sky last week! At first I figured it was a plane, then I saw 3 more lights following it-I freaked out and yelled to get someone inside the house come out and witness it too, but then it was gone. Wonder if its related?
Friction doesn't play as much a part in it as the conservation of energy does. That meteor was traveling at an extreme velocity. When it hits the moon that velocity can't just disappear, seeing as energy is invariably conserved, therefore the energy is just converted from kinetic energy into electromagnetic radiation and thermal energy.
The frequency of Earth-Moon system meteor encounters is such comforting information to know if you're in LEO. But if you're willing to do that kind of job, it's likely you're aware of those statistics ahead of time. (I suppose you could take comfort that it's likely to be over rather quick if the odds ever catch up and something does happen. The other good news is that space is big, and you're more likely to get hit by lightning while on Earth.)
It's a reasonable question, meteors harbor huge amounts of energy because of their speed. Basic physics tells us that energy never disappears but instead merely changes forms. In this case, the meteor has it energy stored as kinetic energy, upon impact the kinetic energy is immediately converted into other forms of energy, in this case mainly light and heat. The phenomena has been recreated in laboratories on a daily basis all over the world.
The word miles (miles an hour) is deeply ingrained in the english language, it sounds so much better to say miles than kilometers, miles rolls effortlessly off the tongue and well worth the simple 1.6 conversion. What do we call 100 seconds?
In first stage, the universal was one material.after it explode to cause of out air pressure and interior process of molecular. It divided several materials like planets, stars and satellites. Infinity energy fee by this process. Who reflect from the surface of sun and reaching whole universal.
WoW, great stuff. Impacts on our Moon or the Earth are all the more interesting when associated with an annual meteor shower, as we believe that the meteoriods associated with comets are likely to be carbonaceous chondrite material. This carbonaceous chondrite material is exciting because it has been found to contain abiotic hydrocarbons including amino acids and in a recent discovery, an amino acid base pair!
The moon explosion is true.This is the 1st time I will believe science! On friday 17th may 2013. I was at a drive-in [Bengies in marland,USA] friday from 8 pm to 1 am saturday,While I and my husband were watching star trek.My husband noticed the moon struggling so with da cloud and he got my attention.Since then I started watching the moon . The moon struggled so hard for some time, then finally there was a sharp lightening out of the moon. We got scared and left the theater,lol.
so if I throw a rock at 56k MPH when hits surface, it explodes creating a visible bright light 238k miles away.Explain it because I dont get it, falling stars have that aspect cos when a meteor is entering our atmosphere, the friction burns it creating a fireball that is sprayed before reach the ground, if moon doesnt have atmosfere, that friction does not exist and there is only the impact of a rock with a barren soil which can cause a big ripple, but never an explosion vidible from earth
Hey could you possibly tell me more about the comet and why they would test the missile on the moon also why would they need to blow up that comet? Plz reply
I'm sure we would, but there's one big problem. Almost everything in the US is manufactured using imperial units, which means that if we were to convert to the metric system, we'd have to redesign everything we manufacture so it fits the metric scale. I'm sure almost every citizen in the US wants to use the metric system, in fact, most schools now teach with the metric system exclusively. But again, everything is made with imperial units, and the cost to convert everything would be too high.
"exactly WHAT is it that is ignited in the impact, exploding, and generating the light" Nothing, if combustion is what you have in mind. The meteoroid is stopped in much the same way a car hitting a concrete pillar would be. In both cases, the kinetic energy is expended. The car gets deformed, and the meteoroid and the immediate impact site simply vaporizes. The superheated gas, containing various elements, expands (explaining the angular size of the light source) and radiates thermal heat.
casual observation here ,, curious the impact location mapping kind of reveals a pattern of hit and miss documentation . Its curious that if you imagined a dotted line curving and surounding the observed areas you would kind of "stitch" a baseball on the surface observed . I know people are going to say the swing of momentum and standard fixation of earthside attitude contribute to this to a greater extent but then conversely the two biggest easily recognized mega craters face the earth
ScienceCast, can you please explain what kind of measurement "a small boulder" is? How does that translate to normal and big boulders? How many pepples go in one small boulder?
Correction of the last post. Since I forgot to cube the mass it changes the result in magnitudes: a 15 km meteorite would weigh 2,100,000,000,000,000 kg. The final answer would be a roughly 160,000 Gt of TNT going off. That's about 10,000 Hiroshima bombs. That would have been a lot more than a small flash. More like turning night into day.
Same reason why there are a lot more craters on the far side of the Moon than on the near side. The near side of the Moon is shielded by a lot of impacts by the Earth.
sooooo the shadow effect of the earth screens out impact from in the general direction between Orbs but what explains the Old big easy visually craters ? How do strikes "catch up " to the moon from behind ? is it that the right side trades position Once to the other side of the marble called earth and is thus leading into the debris colliding with Dual planitary precession around the sun ?
Okay, I have a question ... there is a picture of all the explosions that have happened over the last eight years ... why is there a strip down the middle of the moon that has had no explosions???
Maybe we should do the math for them. The meteor has a MASS (which gravity doesn't effect) of 40kg and was travelling at 56k km/h so the equation works out to 622222 N (newtons of force) or impacting with a force of 63448 kg (using the conversion of 1N = 9.81kg
An atmosphere is required for something to burn...i.e. oxidize, and specifically an oxygen-bearing atmosphere. When an body with lots of kinetic energy hits an immovable object (Luna isn't immovable, but relatively compared to a ten pound rock it is) the body decelerates instantly and that energy has to go somewhere...it is converted to heat, melting the rock. Think of a few things, if you catch a 95-mile hour baseball with your bare hand, then your hand get hot.
Caen mas objetos en la tierra, pero la mayoría no llegan a la superficie por que se desintegran en la atmósfera. Otros caen sobre el mar, y los impactos de los que caen en tierra firme y son lo suficientemente grandes para dejar un cráter son borrados por la erosión y por las plantas.
since the moon has no atmosphere, the rock doesn't glow until it finally hits the surface. compare with earth meteors which glow for an extended time. as for ripples, we might need clarification about what you mean. a pool of water will ripple when you drop a rock in it, but certainly not a solid object.
Nice data collection going on here. Over time the collected data along with water and mineral resources should help pick a good location for a long term settlement.
The footnote on their news story on science.nasa.gov covers this: Footnote: (1) The Moon has no oxygen atmosphere, so how can something explode? Lunar meteors don't require oxygen or combustion to make themselves visible. They hit the ground with so much kinetic energy that even a pebble can make a crater several feet wide. The flash of light comes not from combustion but rather from the thermal glow of molten rock and hot vapors at the impact site.
These meteorites reach speeds of ~70 km/s. This is enough to completely evaporate (so beyond melting) it upon impact. This is because the earth sweeps them up as it revolves around the sun.
When I push the button on my air gun, is it the higher pressure in the air hose pushing its way out the nozzle, or the lower pressure in the room pulling the air out of the nozzle?
Willoughby Krenzteinburg But, what is the "normal" or average pressure in the universe? I think you will agree that it is "0". I'm just trying to think out of the box here. If I expeled all of the air from my air tank, I suppose it still has 14.7 pounds per square inch when they equalize. Even tho the gauge say's "0". Why doesn't our earth pressure just simply blow to outer space? Thanks for your comment.
x2malandy Well because gravity is holding all the air to the Earth. Gravity is the entire REASON that there is atmospheric air pressure. It's literally the WEIGHT of the air that is doing the pushing. At the surface of the Earth (sea level), it is 14.7 psi. The guage on your tank is not measuring absolute pressure. It can only measure that pressure ABOVE atmospheric pressure, so when it reads "0", the pressure in the tank is zero pounds above 14.7 psi. Intersting and related tid bit if you follow football and the recent 'deflate gate' story where the Patriots balls where 2 pounds under inflated. People keep talking about how they were 16% under inflated, but what they fail to account for is absolute pressure. The balls are supposed to be aired up until a guage will measure 12.5 psi, but that's 12.5 psi ABOVE the atmospheric pressure. Boston is at sea level, so the absolute pressure is 12.5 PLUS the atmospheric pressure of 14.7, so 27.2 psi. 2 pounds under inflated is only 25.2 psi, so the balls are actually only 7% under inflated.
Ison's trajectory doesn't impact Earth (and seems to be on an escape trajectory after this pass). Its volume is estimated to be about 1/8th that of Halley's Comet, whose debris trail we pass through twice a year without incident. The meteor over Chelyabinsk was about 250 times as massive as the one in the video. We'll be fine.
There is no oxygen to cause anything to burn on impact like on earth. So then, Is what I saw only a big spark from rocks hitting each other? Hold it, No oxygen, can rocks spark? What the heck caused the light? What happened?
You don't need oxygen for light to be given off during an impact. When you turn on a burner on an electric stove it glows red due to heat, even without oxygen it would do that. Just like the filament in an incandescent light bulb glows from the heat without oxygen.
Ok, the filament in a light bulb was a good one. Got me thinking again. A nuculer explosion would not require oxygen, yet it gives off enough light and heat to vaporize people and burn concret. There is a metior crater in Arizona in which I have walked in the bottom of. I bet that gave off a bright flash when it came in and hit earth.
If I can elaborate, for those interested: the light does not come from something burning, it comes from the extreme heating of the rock and the surface of the moon where it struck - there is so much kinetic energy that it heats it white-hot and vaporizes it, creating a huge cloud which then cools down and disappears very quickly.
On a very modest scale, you could demonstrate this heating (conversion of kinetic energy into thermal energy) at home: if you have a hammer and a ball of lead or other soft material, hit the ball with the hammer a bunch of times and it warms up. When the hammer hits the ball, most of the kinetic energy (of the moving hammer) is converted into thermal energy (to heat the ball). In theory, you could keep doing this until the ball was glowing red-hot, white-hot, etc.
03:30 "Is it safe to moonwalk? The middle of March might be a good time to stay inside."
Now we only need some moon habitats that can resist meteors impacting at 56000 mph.
shows how dangerous it would be to build a manned habitat on the moon surface - we take our atmosphere for granted as a shield
Moon Base with freaking LaSeR BEAMS!
Chuck Norris called, he wants his golf ball back.
lol
Great info and visuals!
The impact actually will generate "ripples", in the sense that it will generate seismic waves that will spread out from the impact site... although nowhere near large enough to detect from orbit I imagine.
There's a useful concept for space suits called a "mechanical counterpressure suit" or "space activity suit" (article on Wiki). Basically, you don't need the entire body in a bag of air; as long as there's mechanical pressure pushing on the skin there won't be swelling or pooling of fluids.
So the suit over most of the body could be, in theory, as thin as a thick elastic cloth. Cool idea but has some hurdles, such as how to get into something so tight, and it needs to be exactly custom-made.
Why the low volume of the sound? At 720p I'd expect a loud and clear sound, crystal voice.
That's cool, glad they showed it. I expected it to be a bunch of photos and not show me the video.
When you hit nail with the hammer a few times it becomes hot. If you hit it strong enough it will glow from the temperature. That's because some of the kinetic energy of the impact changes into thermal energy. The rest of the energy goes into bouncing back the hammer of the anvil.
In the case of moon and asteroid it's the same, but the velocity was much, much bigger, hence the temperature created was much bigger and that's why it flashed.
Leonard: "Told you." (slams door)
Sheldon: (to himself) "What would Spock do in this situation?"
it's absolutely the friction of the impact. the impact speed was in the tens of thousands of miles per hour. most solids are vaporized at these energies.
this is amazing.
Reminds of the episode in Cosmos where Carl Sagan tells a story about the people who saw a huge explosion on the moon!
Man I need to look up more
Energy is released as electromagnetic radiation (what light is). Most of the time heat is released as infra red (which is what heat sensing cameras see) but when enough energy is produced visible light is emitted, like when metal glows red hot. Fire is just one example of something that produces enough energy to be seen.
15,5 miles per second the speed of imact...
Seeing this bright explosion in the moon through you tube is terrific even this fire stone donot leave the space also.
Please put a video camera on ison
Just out of curiosity, is a "working hypothesis" different from what we used to call (in the olden days) a "hypothesis"?
How would they know the speed of this specific meteor?
Interesting that this is more than 10 times the speed with which the LCROSS program impacted the moon in 2009.
I saw some stuff in the night sky last week! At first I figured it was a plane, then I saw 3 more lights following it-I freaked out and yelled to get someone inside the house come out and witness it too, but then it was gone. Wonder if its related?
Friction doesn't play as much a part in it as the conservation of energy does. That meteor was traveling at an extreme velocity. When it hits the moon that velocity can't just disappear, seeing as energy is invariably conserved, therefore the energy is just converted from kinetic energy into electromagnetic radiation and thermal energy.
Do we have materials that can withstand 5 ton impact events to use for moon base building?
The frequency of Earth-Moon system meteor encounters is such comforting information to know if you're in LEO. But if you're willing to do that kind of job, it's likely you're aware of those statistics ahead of time. (I suppose you could take comfort that it's likely to be over rather quick if the odds ever catch up and something does happen. The other good news is that space is big, and you're more likely to get hit by lightning while on Earth.)
It's a reasonable question, meteors harbor huge amounts of energy because of their speed. Basic physics tells us that energy never disappears but instead merely changes forms. In this case, the meteor has it energy stored as kinetic energy, upon impact the kinetic energy is immediately converted into other forms of energy, in this case mainly light and heat. The phenomena has been recreated in laboratories on a daily basis all over the world.
Probably a future spacesuit design to increase agility. It isn't like their legs are exposed.
He did answer the question.
The narrator sounds soooo enthusiastic
this is the best meteor hitting the moon footage we can get, are you kidding me, what the hell are you hiding up there
The word miles (miles an hour) is deeply ingrained in the english language, it sounds so much better to say miles than kilometers, miles rolls effortlessly off the tongue and well worth the simple 1.6 conversion. What do we call 100 seconds?
In first stage, the universal was one material.after it explode to cause of out air pressure and interior process of molecular. It divided several materials like planets, stars and satellites.
Infinity energy fee by this process. Who reflect from the surface of sun and reaching whole universal.
WoW, great stuff. Impacts on our Moon or the Earth are all the more interesting when associated with an annual meteor shower, as we believe that the meteoriods associated with comets are likely to be carbonaceous chondrite material. This carbonaceous chondrite material is exciting because it has been found to contain abiotic hydrocarbons including amino acids and in a recent discovery, an amino acid base pair!
The moon explosion is true.This is the 1st time I will believe science! On friday 17th may 2013. I was at a drive-in [Bengies in marland,USA] friday from 8 pm to 1 am saturday,While I and my husband were watching star trek.My husband noticed the
moon struggling so with da cloud and he got my attention.Since then I started watching the moon . The moon struggled so hard for some time, then finally there was a sharp lightening out of the moon. We got scared and left the theater,lol.
Yes, absolutely.
so if I throw a rock at 56k MPH when hits surface, it explodes creating a visible bright light 238k miles away.Explain it because I dont get it, falling stars have that aspect cos when a meteor is entering our atmosphere, the friction burns it creating a fireball that is sprayed before reach the ground, if moon doesnt have atmosfere, that friction does not exist and there is only the impact of a rock with a barren soil which can cause a big ripple, but never an explosion vidible from earth
Did anybody notice that this was posted a day before it happened?
Thanks man I had no idea such awesome thing existed! :D
Hey could you possibly tell me more about the comet and why they would test the missile on the moon also why would they need to blow up that comet? Plz reply
i think these fonts have been used in many occasions, not just that game.
this kind of news makes more sense to me now. thanks KerbalSP
I'm sure we would, but there's one big problem. Almost everything in the US is manufactured using imperial units, which means that if we were to convert to the metric system, we'd have to redesign everything we manufacture so it fits the metric scale. I'm sure almost every citizen in the US wants to use the metric system, in fact, most schools now teach with the metric system exclusively. But again, everything is made with imperial units, and the cost to convert everything would be too high.
"exactly WHAT is it that is ignited in the impact, exploding, and generating the light"
Nothing, if combustion is what you have in mind. The meteoroid is stopped in much the same way a car hitting a concrete pillar would be. In both cases, the kinetic energy is expended. The car gets deformed, and the meteoroid and the immediate impact site simply vaporizes. The superheated gas, containing various elements, expands (explaining the angular size of the light source) and radiates thermal heat.
by heat, anything once it gets hot enough emits light. That is how lightbulbs work as well.
It's not only about the explosion, genius!
casual observation here ,, curious the impact location mapping kind of reveals a pattern of hit and miss documentation . Its curious that if you imagined a dotted line curving and surounding the observed areas you would kind of "stitch" a baseball on the surface observed . I know people are going to say the swing of momentum and standard fixation of earthside attitude contribute to this to a greater extent but then conversely the two biggest easily recognized mega craters face the earth
Explosion still alot smaller than the tsar bomb. Does that mean we can see the tsar bomb super clear from space?
ScienceCast, can you please explain what kind of measurement "a small boulder" is? How does that translate to normal and big boulders? How many pepples go in one small boulder?
encyclopedia2.thefreedictionary.com/Boulder+(geology)
At 0:40 it kinda looks theres a line going round the moon, as if it has been joint together by two half pieces.
Correction of the last post. Since I forgot to cube the mass it changes the result in magnitudes: a 15 km meteorite would weigh 2,100,000,000,000,000 kg. The final answer would be a roughly 160,000 Gt of TNT going off. That's about 10,000 Hiroshima bombs. That would have been a lot more than a small flash. More like turning night into day.
It isn't the average American who is coming here to watch science news and acquire information.
Same reason why there are a lot more craters on the far side of the Moon than on the near side. The near side of the Moon is shielded by a lot of impacts by the Earth.
*than
It actually is the force of the impact creating molten rock that flew in the air. Google this event to find articles on it
actually the video narration and the date listed in the video state that it happened on march 17th, not may 17th.
@Logan. It was published May 16...
It happened 2 months ago and we only find out now?
1:20 Metric size, metric weight, imperial speed, head explode.
sooooo the shadow effect of the earth screens out impact from in the general direction between Orbs but what explains the Old big easy visually craters ? How do strikes "catch up " to the moon from behind ? is it that the right side trades position Once to the other side of the marble called earth and is thus leading into the debris colliding with Dual planitary precession around the sun ?
I can't believe the stupid, idiotic comments here. Wow...
adds a whole new meaning to going out for come chinese
The "explosion" is at 0:47.
Why do they meters and kilograms AND miles per hour? That is kind of unproffesional. Either use SI units or imerian units but dont mix them.
What does "the size of a small boulder" actually mean?
why don't people watch this channel?? this is humanity's doorway to future
Why aren't the impacts spread evenly across the surface?
Let me convert that for you:
1 mile is equivalent to 1609.34 m
Therefore 55000 mph = 24587.2
Weight: 40 kg
Size: 0.3 - 0.4 m
Speed: 90000 km/h
Oh, hollow. That's exactly like your skull. That's comforting.
There are different time zones... Some countries are hours ahead.
Time zones?
The universe is a big place, we don't know everything and our scientists are doing their best.
Okay, I have a question ... there is a picture of all the explosions that have happened over the last eight years ... why is there a strip down the middle of the moon that has had no explosions???
WHAT TIME?
De nada Alfredo cualquier duda pregunta mela...
Nevermind, it was posted may 16th, my mistake..
Maybe we should do the math for them. The meteor has a MASS (which gravity doesn't effect) of 40kg and was travelling at 56k km/h so the equation works out to 622222 N (newtons of force) or impacting with a force of 63448 kg (using the conversion of 1N = 9.81kg
An atmosphere is required for something to burn...i.e. oxidize, and specifically an oxygen-bearing atmosphere. When an body with lots of kinetic energy hits an immovable object (Luna isn't immovable, but relatively compared to a ten pound rock it is) the body decelerates instantly and that energy has to go somewhere...it is converted to heat, melting the rock.
Think of a few things, if you catch a 95-mile hour baseball with your bare hand, then your hand get hot.
Caen mas objetos en la tierra, pero la mayoría no llegan a la superficie por que se desintegran en la atmósfera. Otros caen sobre el mar, y los impactos de los que caen en tierra firme y son lo suficientemente grandes para dejar un cráter son borrados por la erosión y por las plantas.
since the moon has no atmosphere, the rock doesn't glow until it finally hits the surface. compare with earth meteors which glow for an extended time. as for ripples, we might need clarification about what you mean. a pool of water will ripple when you drop a rock in it, but certainly not a solid object.
another is the 2 months it took to think about publishing this "breaking news"
why would it ripple and why wouldn't there be an explosion?
Nice data collection going on here. Over time the collected data along with water and mineral resources should help pick a good location for a long term settlement.
Considering the average American's education, that narrator is just perfect.
The footnote on their news story on science.nasa.gov covers this:
Footnote: (1) The Moon has no oxygen atmosphere, so how can something explode? Lunar meteors don't require oxygen or combustion to make themselves visible. They hit the ground with so much kinetic energy that even a pebble can make a crater several feet wide. The flash of light comes not from combustion but rather from the thermal glow of molten rock and hot vapors at the impact site.
These meteorites reach speeds of ~70 km/s. This is enough to completely evaporate (so beyond melting) it upon impact.
This is because the earth sweeps them up as it revolves around the sun.
When I push the button on my air gun, is it the higher pressure in the air hose pushing its way out the nozzle, or the lower pressure in the room pulling the air out of the nozzle?
Air always flows from high pressure to low pressure until it equalizes.
Willoughby Krenzteinburg But, what is the "normal" or average pressure in the universe? I think you will agree that it is "0". I'm just trying to think out of the box here. If I expeled all of the air from my air tank, I suppose it still has 14.7 pounds per square inch when they equalize. Even tho the gauge say's "0". Why doesn't our earth pressure just simply blow to outer space? Thanks for your comment.
x2malandy Well because gravity is holding all the air to the Earth. Gravity is the entire REASON that there is atmospheric air pressure. It's literally the WEIGHT of the air that is doing the pushing. At the surface of the Earth (sea level), it is 14.7 psi. The guage on your tank is not measuring absolute pressure. It can only measure that pressure ABOVE atmospheric pressure, so when it reads "0", the pressure in the tank is zero pounds above 14.7 psi.
Intersting and related tid bit if you follow football and the recent 'deflate gate' story where the Patriots balls where 2 pounds under inflated. People keep talking about how they were 16% under inflated, but what they fail to account for is absolute pressure. The balls are supposed to be aired up until a guage will measure 12.5 psi, but that's 12.5 psi ABOVE the atmospheric pressure. Boston is at sea level, so the absolute pressure is 12.5 PLUS the atmospheric pressure of 14.7, so 27.2 psi. 2 pounds under inflated is only 25.2 psi, so the balls are actually only 7% under inflated.
Got ya, So then 1 square inch of air from ocean level to outerspace weigh's 14.7 pound's?
x2malandy exactly!
en.m.wikipedia.org/wiki/Atmospheric_pressure
Ison's trajectory doesn't impact Earth (and seems to be on an escape trajectory after this pass). Its volume is estimated to be about 1/8th that of Halley's Comet, whose debris trail we pass through twice a year without incident. The meteor over Chelyabinsk was about 250 times as massive as the one in the video.
We'll be fine.
I didn't know Daria narrated ScienceAtNASA videos.
The answer is: 42 or is it 44?
I clicked on this video expecting a huge bomb-like explosion, and all it was was a tiny spark....
here in Lousiana, it was "meteorite hits moon"
There is no oxygen to cause anything to burn on impact like on earth. So then, Is what I saw only a big spark from rocks hitting each other? Hold it, No oxygen, can rocks spark? What the heck caused the light? What happened?
energy of impact melts some rock
You don't need oxygen for light to be given off during an impact. When you turn on a burner on an electric stove it glows red due to heat, even without oxygen it would do that. Just like the filament in an incandescent light bulb glows from the heat without oxygen.
Ok, the filament in a light bulb was a good one. Got me thinking again. A nuculer explosion would not require oxygen, yet it gives off enough light and heat to vaporize people and burn concret. There is a metior crater in Arizona in which I have walked in the bottom of. I bet that gave off a bright flash when it came in and hit earth.
x2malandy thats why it only flashed when it impacted, not while it falls
I agree.
The heat of the meteorite's very high speed
She is clearly excited to be there.
I love this channel!!
Example?
0:29 "On march 17, 2013, and object about the size of a small boulder, hit the lunar surface in Mare Imbrium" WHY ARE WE JUST HEARING ABOUT THIS?