What Would Happen If Asteroid Bennu Hit Earth?
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- Опубліковано 29 вер 2024
- After OSIRIS REx grabbed a sample a coupe of weeks ago many people remarked on how the asteroid just seemed to disintegrate when sampled. Some commenters took this fragility as a sign the asteroids would just disintegrate in the atmosphere before it hit the surface of earth.
Unfortunately that's not the case, Bennu is so large that it would still hit the surface, albeit in fragments and still cause massive amounts of damage.
Crazy idea but is there any possibility of changing the asteroids trajectory so that it gets a gravity assist off earth that sends it into another planet? This would remove possibility of future impact and we could study/use the impact somewhere else.
It could probably be redirected to hit the moon with a future impact, and that wouldn’t take nearly as much deltaV as it would to make it encounter Venus or Mars, even decades later.
Even modern spacecraft need course corrections to get to other planets because of our limited precision. The effect of a gravity tug on the course of an asteroid being absolutely glacial, I think it's really unlikely this could be done. Maybe if Mars just happened to be in exactly the right place at the right time, I suppose.
A better idea, if a collision becomes too likely, would be to just blow it up well in advance so we'd get another annual meteor shower instead. No need to fool around with gravity tugs and junk like that.
NASA is trying something like that with DART. But their aim only is to change the course of an asteroid so that it wouldn’t hit earth
It is year 2060 we are talking about. We most likely won't look at it as a threat anymore, but as free resources for the Earth's orbital economy.
Smashing it into anything is a waste.
@@wurfyy On the contrary, I think the effect of a gravity tug being "absolutely glacial" would make it easier to do. Small adjustments could be made throughout the entirety of the months long "burn" based on tracking updates.
And there's a major problem with the "blowing it up" strategy. What are you going to do it with? Nukes? Might be good for a last ditch effort, but otherwise you're now going to be showering Earth with radioactive gravel and boulders, when you could have not showered Earth with anything by redirecting it. That's not to mention a gravity tractor or similar device would undoubtedly be much less expensive than a space nuke, and cause much less international controversy.
"One ton of solid iron has the same kinetic energy as one ton of loose gravel"
"Ah dohn get eht."
"But iron 's heavier than gravel."
But look at the size of the loose gravel, thats cheating
@Mycel it's jon snow
Gravel is like.. 200g less dense than iron... so iron must be heavier.... I don’t get it
mass times speed is energy. simple. doesn't matter what it is made off. even something as light as a pingpong ball can hurt if it hits you fast enough
I was reminded of people who claimed that birdshot from a shotgun was harmless. Not at close quarters, it isn't.
I also thought about the reason nuclear war strategists move to MIRV, multiple warheads that spread out, rather than single high yield bombs. The latter waste energy blowing up the same area many times over, while the former MIRVs distribute the same explosive energy more devastatingly over a wider circle. I wondered from the start if there would be enough time for the Bennu rubble to spread out between entering the atmosphere and hitting ground?
If you haven't already done an episode on this, it'd be interesting to see an EROEI analysis of mining asteroids for rocket fuel, including the energy needed for orbital capture around wherever the rockets needing the fuel would be (moon, Mars, etc.) vs. energy needed to orbit-match, mine it in situ, and retrieve just the (at least somewhat refined) fuel.
Scott Manley videos, be they "What if" knowledge bombs or Kerbal War Crimes against Jebediah, are truly timeless. Catch them in the first week they come out or months/years later, they are always worthily of your time and always age extremely well.
To look at the bright side - it would significantly reduce the launch costs for future Bennu Missions
The image of the asteroid gave me a thought.
To not able to explain something, doesn't make it weird
.
You can know something without understanding it
.
You can understand something without knowing how to explain it
.
Weird is when you don't know something, not when you don't understand something
.
And sometimes somethings can be understood and explained, but not known
.
Therefore making it weird
.
Waves for example, throughout history people didn't truly understand how they were formed, but I don't think they were weirded out by them, because they knew what they are, but they didn't understand it. And some people notice that birds migrate before storms, so they understood that but they can't explain it. And for me space and asteroids and planets are things that can be explained and understood, but for me they are unknown, therefore they are weird for me. For thousands of years humans first notice how the nature works itself sometimes they could understand it and sometimes they can't understand it but for thousands of years they knew what nature is, it was never weird for them. But now we skip the step where we just live with space the same way we lived with nature and just jump to conclusions and explanations and understanding, even if we are successful in understanding space, I think it would take us many more years for us to know space and live with it, without feeling weirded out about.
(English isn't my first language so excuse any mistakes, and if you read all of that, thanks for hearing me out! :) its the first time i write something like this on a youtube comment section)
The entire atmosphere is roughly the equivalent of 10 meters of water when talking about impacts and such. The majority of what we see in meteor showers are from rocks the size of a grain of sand up to maybe a pea.
Walt Brown predicted what the makeup of these things would be decades ago.
An iron asteroid would be like a bullet, a rubble pile would be like bird shot. Both can kill you if they hit you right.
"lol 00 buckshot is just 9 little tiny metal balls .30 inches across, they weigh practically nothing. Therfore getting blasted with a 12 gauge shotgun at point blank range isn't even remotely dangerous." -- a genius.
Hi Scott, I hope you are well and than you for another great video. Can I make a suggestion? Can you do the same for Apophis?
I'm sure NASA scientists and you, are far more knowledgeable on this topic, but it would seem to me that as loose as Bennu is and the amount of gravity holding it together, it would fragment and disperse into literally millions of much smaller meteors and the amount of surface area exposed to the earths atmosphere on reentry would cause quite a light show but ultimately would burn up. To illustrate my theory, imagine a 12ga shotgun slug versus a 12ga shotgun pellet shell. Both have the same weight and velocity and ultimately could hit a piece of plywood with the same amount of foot pounds of energy, however, the slug would punch through the plywood, whereas the pellets would be stopped by the plywood.
2137? By that time the asteroid will be besieged by space mining companies that pick that thing apart down to nothing
LOOK there are no stars in the sky and the Asteroid is flat!!!!!
:)
Well I guess ORIRIS-REx just saved humanity...
Well that just means we got time to get a gravity tractor in position! Get it away from the dangerzone.
maybe someone already said it, and maybe I'm talking out of my bumhole but if we needed to alter trajectory by small amounts to avoid it hitting us, couldn't we do it by RCS thrusters or something like that? why talk about nukes when we need to move fraction of degree to change its trajectory? Cheap, simple, proven and easy to propel it to asteroid. Put it on small spacefraft that can also serve as "target" for tracking changes, fire as needed and be done with it
One problem is that we don’t really know what is in the center of these kinds of asteroids.
Getting information on that was a goal of this mission, not just to collect a sample.
It screams towards earth, earthlings scream. As everyone prepares to die...there's a sound like a squeaky toy...as it just flumps onto the ground.
Yes, flumps is a scientific term for 'falling in a lump".
who’s here after the news of the high probability of it hitting earth
Another amazing clip - thanks.
Hayabusa camera looks lowabusa resolution.
Thanks I'm here all week
Groan. :-)
Shew you had me worried there for a minute😌
RIP Rockwille I guess
Hello, can you make a video explaining in details how a rocket stands on the launch pad? Supports, internal structure that sits on those supprts, locks, release of locks etc.. Thank's
You neglected to point out that the air pressures you are describing are at sea level. Air pressure drops off dramatically in relationship to altitude.
Someone should do the math for a 7kg bowling ball / shot put, being lobbed out of a shuttle bay, at just below C, in the direction of the earth, let alone a 3,400kg Federation Mk-6 Shuttle or a 10,000kg Rebel T-65B X-Wing having a prang with a planet (who needs a Death Star, as that won't buff out).
I am impressed that you converted to imperial units first for us colonials
Seems it could melt the rock into bigger pieces at the right temperature
We better send Bruce Willis up there while he's still alive.
Its density is so low it'd just burn up right? So eventhough its kinetic energy would be high enough to "explode" the friction from atmosphere would basically disentigrate it right? Maybe a cunck of iron inside of it would make it but it would loose a lot of energy.
yeah dude but the "clump of" just rocks assembled on burn in at 5000° F rocks melt at 1,100 and 2,400 degrees Fahrenheit Solar close passings Sufficient to convert pile or clumps into solid form
So it seams to be hollow? How does that change the dynamics of an atmosphere intersect? Would that disperse the energy and likely not hit the surface as a large mass, but many smaller dispersed impacts?
2:14 but what about One Ton of tightly packed feathers?
What's keeping them tightly packed? It seems to me that (without a binding agent) the feathers would be (at best) as closely spaced as their springy barbs would allow, which would still leave a lot of space between. Deceleration from 20 km/sec would perhaps compress the mass some, while quickly converting the leading edge mass to plasma, but there would still be more openings than mass, allowing the bolus to quickly disintegrate and be individually decelerated / liquidated. I would guess that the trailing portion would survive and slowly precipitate.
Shuttle Columbia was much more cohesive, and at Mach 18 was traveling much slower than 20 km/sec. Considering these factors offset, we could reasonably posit that the feathers would be dispersed and precipitating by that altitude, if not much higher. Most of the energy release would have occurred much higher than the Chelyabinsk meteor.
I was told there wouldn’t be any math.
Can we just... *breaks it apart before it gets close*
Excellent, Beautiful, and Superb explanation & discussion of asteroid entry into Earth’s atmosphere. The simulation you presented does not take into account the metallic contents. Example: Aluminum, Calcium, Magnesium, usw…usf…
Thus, such an asteroid may have a substantial percentage of its mass FUSE INTO A SMALLER BUT MORE DENSE CONFIGURATION that would then transfer Many x Many Newtons (MEGATON-EQUIVALENTS) OF ENERGY as it slows into the atmosphere and can devastate a city. This study/simulation has already been done at Fermilabs.
Salomè (Live well and in Peace).
Salomè.
Mögest Du in das Licht, der Wahrheit, und dem SEIN der Schöpfung leben.
7:25 Thanks for blowing up Rockville MD. The traffic there is terrible anyways.
Would anyone really notice?
I was hoping for the POI to be Washington, DC myself.
"So without even trying, we have actually changed things." Pretty much sums up the history of humanity on Earth.
I’m sorry but humans have done nothing but change things on purpose. Look at housing developments they used to be forests and damns that have created lakes. We’ve actually done the opposite of your comment.
@@whatjake7898 humans did not plan to screw up the climate, flood all the major coastal cities, kill themselves with hunger and heat and cause wars due to overpopulation and mass migration. Some are even trying to deny that this scenario is already in progress. No, humans just want a new thing, and that other new thing, and the new thing which that guy has, and also some fun and money. Bam! Catastrophe.
@@neithere As someone with an Environmental Science degree I cannot tell you how inaccurate and uneducated this comment is. Please stop expressing your opinion until you get some critical thinking skills.
@@whatjake7898 First, please stop expressing your opinion about other person's skills until you learn a bit about those. Second, please stop trying to stop others in expressing their opinions. Third, please do tell me how inaccurate that opinion was. Not that my comment was completely serious, but I wonder what exactly made you so upset. Is it the scale of the projected future events or the causality?
@@neithere You're spreading misinformation. I will not stop calling out those who do zero scientific research before opening their mouths. Maybe you should stop spreading inaccurate information if you do not want to be judged negatively based off your opinions you post online. I'm not STOPPING you. Just making a suggestion so you stop making yourself look like a fool. And upset? You will have to let me in on the software that lets you hear the tone in my comments. I'm just trying to educate the uneducated.
Its 2020. DO. NOT. TEMPT. THE. MAGIC. BOULDER!
Im sure this will be the year where we will an IRL Deep Space Kraken
LMAO, the green one from KSP ?
@@apyr1439 I read that as Deep Space Karen.
@Dave P. Meanwhile, we have already nice options with the Coronavirus lol
Wow. Dusting off the classics. I approve!
Mass is mass. When talking about the different types of asteroids hitting Earth a teacher once told us to imagine a shotgun slug vs bird shot.
man that is so american
A shotgun slug across a field will kill you. Bird shot across a field bounces off your jacket.
@@rasaecnai Most American thing ever xD
Did your teacher suggest to imagine shooting soda cans across an American football field?
@@NikovK This isn't like shooting across a field, Bennu is about 0.25 KM across and if the atmosphere was uniform density it would be 8.5 KM deep, so if a bunch of bird shot or a shotgun slug is an inch long the protection offered by the Earth's atmosphere from Bennu would be equivalent to the protection 34 inches(0.8meters) of air would give you from the bird shot. At that distance there is basically no difference between a load of bird shot and a slug. Edit, I saw 262 meters and didn't bother to read that that was radius instead of diameter, so Bennu is actually about 0.5 km across and earths atmosphere would be as effective as 17 inches(0.4meters) of air between the shotgun muzzle and yourself.
I just realized that we have started asteroid mining... now it is only a small step towards a pirate base in one!
YAAAAAAARRRRRRRR!
Hell yeah!!!
Nice to think your average mining setups would only need shovels instead of drills or rock breakers.
I'll donate to your Space Pirate Asteroid Base Kickstarter!
@@Vespuchian Exciting times!. Given the gravity, it is more like shoveling grain while standing in a grain silo - sounds easy till you try it. You can literally jump off this asteroid to escape velocity as I recall (0.7km/hour) so you can throw rocks to the hopper on your mining ship "in orbit". The big problem is almost all mining equipment relies on gravity and/or atmosphere for correct operation so there are whole new technologies needed to make space mining happen.
*Humans see an asteroid*
“You know... I really wanna poke it with a stick.”
Poking with a stick is the natural instinct to science.
@@Yora21 As long as you write it down.
Yora you’re not wrong
Marvelous summation of the human condition. . . and why we beat the dolphins to civilization!
@@Jibberellin That and thumbs; those aquatic nerds can suck it.
Hi Scott. I'm another Scott, from Scotland and I studied Aerospace engineering :)
But your calculation on kPa to Bar is wrong. 1 bar is 100kPa (1x10^5).
You got beat by another comment by the way...
Ah but you weren't .. :)
Scottland
You're the backup
Unrelated to the actual content of the video... 8:08 is such a beautiful way to display inclination
i'm inclined to agree
@@alquinn8576 you.. you.. ugh just take my like.
Oh yeah. I didn't even notice. Kerbal Space Program should take notes.
@@snozzmcberry2366 I hope to see it in KSP 2, if not it seems like a reasonably moddable thing.
@@alquinn8576 nature abhors a pun
If that hit Buenos Aires i can see the Mobile infantry being deployed to Klendathu
I'm from Buenos Aires, and I say KILL 'EM ALL
I'm doing my part!
The only good bug is a dead bug!
C'mon you Apes do you want to live forever!!?
At least it'll have a kickass soundtrack.
* 5:55 100 bar is 10.000 kilopascal
Lol I knew that... wtf
Yes it's supposed to be 1 bar
I dropped the correction in because I missed ‘kilo’ and just messed things up even more
Nice video anyway
@@scottmanley I haven't been studying for long, but if I have learnt anything then it's probably this conversion ratio. :D
It's just incredible to be able to witness a body like Bennu up close and in detail. Very educational.
And the educational aspects; totally wasted on 80% of our population!
It's the old school kid maths question, "What weighs more, a tonne of iron or a tonne of feathers?"
Answer: Drop it on your toes and tell me which hurt more.
Actually, the ton of iron. On earth anyways. They have the same mass but not the same weight. The feathers have more volume and thus more buoyancy in the air, making them weigh a few grams less.
@@Electroblud That's mathematically impossible unless you are talking about the rate of acceleration outside of a vacuum. They weigh the exact same since they were being set at equal weight before you mess with it. You are thinking of force, which is mass times velocity, which is why it would hurt more to have steel dropped on you rather than feathers (outside of a vacuum that is).
@@wvance0316 Ah, you weigh them at 1 ton inside the atmosphere? Then the feathers actually have more mass. Since you need more of them to counteract their buoyancy. I am not talking about atmospheric drag. Think about dropping a piece of wood in water vs a piece of steel. Under water, the wood actually has NEGATIVE weight. Weight being the downward force an inert object at rest applies to whatever it is resting on.
Depends, which is metric and which is outdated?
Given the "rubble pile" composition, how would tidal disruption during approach to Earth impact affect the spread of the overall mass as it entered the atmosphere? I would expect that in the last minutes the breakup would make it more difficult to reach the ground. Of course, this would all depend on things like approach angle and overall relative velocity.
Unless the angle of impact is very shallow, like
My guess is that it the size of the asteroid is large enough to generate significant tidal forces, the asteroid is so large as to be extinction-level
More to the point is the energy states of the magnetosphere and the fact that Bennu has no cohesion at all. A good portion of it would likely go into orbit and slaughter our satellite system.
@@theelectricwalrus he meant the tidal forces on the asteroids, not us
@@prjndigo Exactly, i'm hearing very few references to Kessler syndrome in all this. Diverting a large loose body mass, no matter how expensive, is still better than letting it make us earth bound for quite some time...
With it being so loosely composed, could a kinetic impactor be a viable option to disrupt it a few days/weeks/months before it impacted the earth, distributing a big portion of it's mass over a much larger area? I'm now imagining Elon hitting the thing with a Tesla Roadster on an escape trajectory from Earth.
You'd need a pretty ludicrously huge kinetic impactor for that. This asteroid still is around 500m in diameter after all. It's a small mountain's worth of gravel.
Actually, I just did the math: a 10 ton impactor going 440m/s would have enough kinetic energy to blow apart the asteroid. Not actually that bad. Surprisingly achievable.
Or is my math wrong? I used the formula for gravitational binding energy from Wikipedia.
@@Electroblud Your math checks out. However, note that blowing it up has the possible side effect of the pieces all individually entering Earth, putting a similar amount of energy into Earth
EDIT: the Grav Binding Energy is a theoretical minimum. In practice, your input energy will be (very) unevenly distributed and thus maybe leaving still big chunks
@@lucas29476 Doesn't matter what you do the total energy released will be the same. However "How" you release that energy matters alot. Spread over a large enough area you would have a spectacular slow motion train wreck as against an even more spectacular instantaneous wreck. (I am referring here more to the long term effects of heat and dust on the Earth)
If you broke it up far enough away would you not be able to ensure that most of the fragments missed the earth?
It would just be Tuesday in the grand scheme of 2020.
true
Hey Scott, don't you think it's interesting that asteroids always seem to hit craters when they collide with earth? Maybe you could do a video about it?
Tunguska and Chelyabinsk didn’t hit craters
@@scottmanley they didn’t collide with earth either.
@@5777Whatup sure they did, the atmosphere still counts
Asteroids are naturally attracted to holes that they can fit it because they need to find shelter
@@toddmccarter45 geologist don’t study air, they study earth like rocks and dirt, therefore we have a very clear definition of what it means to hit earth. They hit organic matter though! But, geologists don’t study pines either... 🤔
We need Bruce Willis on this problem, stat.
Good thing Bruce Willis with scottish accent is already on it
When I close my eyes I can still hear this guy saying AIR-th
Yes, and "beuster". Love it!
Ok now your just giving 2020 ideas
2060, 2020's rerun
@@vast6056 2020 is no doubt the new normal.
booo
@@vast6056 what about 2040?
Just imagine the year 202020. We have to spread out quickly in our galaxy, because the events in 202020 won't just affect a single star system.
inb4 we accidentally gravity-tractored it into ourselves while OSIRIS-REX was keeping itself parked above the asteroid waiting to take a sample
A most fitting end for the year of 2020
lol
Thank you Scott for the amazing content!
You have inspired me to want to study aerospace engineering!!!!
I'll tell you what happens. We finally have the sweet release of death.
Edit: ok guys I get it i made yi uall laugh a little bit but it's about enough with the likes we have to prep stuff if something happens so we survive the fallout.
I think it would take the edge off my day fore sure.
How could you make a video about asteroids and not mention the meteor in Sweden yesterday evning!? Maybe this is a common occurence but holy shit it took me by surprise. The whole sky just lit upp in blue for a few seconds, me and my friend who was out for a walk thought the world just ended or something...
civilized species digging up big boned monkes 65 million years later: interesting
What do you get when you cross a crumbling space rock with a species that pokes it and treats it like an experiment!? I'll tell you what you get: YOU GET WHAT YOU DESERVE: A Scott Manley video!
0:35 I'm fairly certain Bennu is held together _constantly_ by gravity, not once per week... 😉
They even leave it on on weekends.
Since they changed hours the gravity is now being serviced on Thursdays.
Don't give 2020 anymore new ideas Scott.
Thanks for the amazing video, Scott! One question, why use a 1 ton "tug-spaceship" if in some years we (might) have a 120 ton Starship (SpaceX) that could in theory do the job? I guess those studies need some new calculations to make up for this new possibility ;)
(One more idea in the list of "once/if we have Starship, why not just throw it at every space problem we have?")
Would it be possible for earth to capture an asteroid and lock it in permanent orbit around the earth, making it into a second moon? Could this happen with Bennu?
Theoretically it is possible, however that would be an awful idea
There is a very small and precise area called a gravitational keyhole, which effectively sets up a future impact event. Such features were studied for Apophis
*"un kg de plume vs un kg de plomb" INTENSIFIES*
English please. Sérieusement.
Well the good news is ScFi has taught us if Bennu did strike the earth it would for 100% sure hit New York City, Who's residents would mostly be saved when hundreds of military helicopters appear out on nowhere to fly them from their roof tops to safety....Yes aside from the crotchety old guy who just wants to read his newspaper, the guys who couldn't resist getting in one more game of chess in the park, the cabdriver who wasn't going to miss day of work just because the city was going to be destroyed and the brave astrophysicist who warned us all, but then gave up his seat on the last helicopter to save someone else, all others would be saved :)
Yes
"Saving the Earth."
What Science is for.
Saving the earth? I think you’ll find the earth will be ok whatever happens. Humans not so much.
1:50 Oh, I know that by watching GrayStillPlays
There is also the chance that the first close encounter is not an impact, but close enough to pull Bennu apart into a string of smaller asteroid balls, "spreading" it into a long chain of less dangerous but higher chance impact objects.
I can't help but wonder if Bennu grazed our atmosphere if that would be enough to rip it apart in a somewhat similar manner to the Great Daylight Fireball of 1972?
7:17 Woah! Why did you put the blast zone there?
The Secret Service would like to know your location.
Um "Rock"-ville ?
Given Bennu's gravity of 0.00009807 m/s² divided by Earth's gravity of 9.80665 m/s2 = .00001, and that Bennu is just a loose pile of rocks barely holding together, would it not begin falling apart due to gravitational sheer well before hitting the atmosphere? That would give the atmosphere a net greater resistance. Especially if the initial approach angle is shallow.
Homeboy these are humans we're talking about here. When the time comes to push an asteroid out of earth's path, we'll just accidentally push it closer.
I just read the part of Nemesis Game where the asteroids hit. Incredible timing!
Dude spoilers
I was amazed the author tried to get us to sympathize with anyone associated with the free navy after that shit.
So how viable is it to actually nuke a large asteroid in space if we determined it was too dangerous for earth? Would making one dangerous object into many thousands of smaller objects be a good idea since, i assume, you would be spreading out the damage on the surface?
or, what if a landed a nuke on an asteroid and just waited for it to be on the other side of the Sun before it detonated? Yeah, no light show for us on Earth, but would the gravity of the Sun help project those objects away from Earth?
Disclaimer: the video thumbnail is not to scale.
There's a video floating around of a large bucket excavator dumping a load of water onto a car and crushing it. Might illustrate the problem a bit.
Now we're asking the real questions
How long has that Dragonriders of Pern book been there? How have I not noticed it until now?
Starship goes zoom and boom on Bennu
Rockets on profile pictures go brrr
Wait that is the goal of the starship???
Correction there have been multiple natural disasters of greater scale in just the last thousand years any volcanic eruption of VEI 7 (more than 100 cubic kilometers of material ejected) is easily in the 10 gigaton range. The most recent is the eruption of Mount Tambora (33 gigaton equivalent) in 1815 which caused the Year without a Summer, global crop failures and killed at least 71,000 people just in the immediate vicinity of the eruption. Not saying impactors are a non issue just that volcanos of VEI 6-8 are a more frequent threat of comparable scale to all but the largest impact events.
Orbit equations look simple enough when you start out with only 2 objects and Newton's or Kepler's laws... then it gets so very complicated with the solar system with so many objects and other factors (relativity, solar wind, collisions) and even with up to date supercomputers they can still have uncertainty - I wonder how the ancient astrologers could predict lunar eclipses so accurately - and motions of other planets!
I was just wondering what Horseshoe orbit meant - and looked it up on Wikipedia and it made sense - like the moons of Saturn and Jupiter that switch orbits each time they come near - they fling each other into swapping further/nearer orbits and don't collide. I just had not thought of it as a horseshoe before because it only looks like that in a rotating reference frame like from the Earth's point of view.
PS are all the Scotts who became engineers or something similar all inspired by Scotty on Star Trek?
Scientists on Earth: **Pokes Bennu**
Bennu: So you have chosen death
At 0 °C and normal sea level pressure a mole of gas occupies 22.4 liters, so a cubic meter of air has a mass of: 1000/22.4 ×makes it 0.02896 = 1.293 kg." Google says
1:17 NASA & JAXA sharing the same image and adjusting the contrast 🤣👍
Nope
@@wierdalien1 *Joke
Ok but what about the considerably more likely (and quite possibly more spectacular) possibility that Bennu gets close enough to the Earth to be tidally disrupted and broken up, a la Shoemaker-Levy?
I keep hearing NASA describing the sample acquisition phases of the OSIRIS REX mission as "tagging" the asteroid. I have no idea why NASA thinks its a good idea to play tag with a potential earth impactor.
It is looking as though Bennu is quite hallow according with NASA. Of course the implications of energy are still there (mass and speed) but could the asteroid fall apart with a close encounter with earth, while passing by. Also, dispite nuclear weapons being usually a bad idea (not for movies), could a nuclear blast along side the asteroid push it towards the sun or another planet (as someone said)? Are there shock waves to consider in the vacuum of space, let's say in regard with thermal radiation?
With any luck in 2060 or even more likely in 2135 it wont be "dangerous potential impact" but "yaaay free asteroid to mine resources of".. for giant orbital space station.
Sure, a little gravel isn't lethal... but this is an entire mine truck worth of gravel, which is a markedly different prospect. Quantity has a quality all its own, after all. Now the interesting question is, how close does it have to come to exceed its Roche limit and get scattered all across space? Would there be sufficient materiel to Kessler our orbits?
Hey Scott, my 8yo says that the light saber held by Darth Vader in the background has the wrong hilt. What's up with that?
Don't lie you spotted that, nerd.
My kid saw it too.... ;)
Your Bennu cross section side view looks like 2 parabolic cups. This makes sense when combining centrifugal force with gravity.
Honest to god if it weren’t for Ksp I wouldn’t understand any of how the close encounters would effect it’s orbit. Understanding that is amazing.
Not sure if anyone else has mentioned it below, but there’s another apocalyptic movie on the horizon (!) called Greenland, about a extinction level event asteroid hitting the earth! Out soon!
100 kPa is not equal to 100 bar. 1 bar is actually roughty equal to an atmospheric pressure (which in turn equals to about 100 kPa)