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AstroPhil
United Kingdom
Приєднався 7 вер 2017
I am a Senior Lecturer in Astrophysics in the School of Mathematics and Physics at the University of Lincoln. This channel contains videos about my research, astronomy and astrophysics tutorials and other interesting videos in astrophysics.
What Makes Ultra Diffuse Galaxies (UDGs) Unique?
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Welcome, my name is Phil, and in this video I discuss what ultra-diffuse galaxies are.
Ultra Diffuse Galaxies (UDGs) are a rare type of galaxy that can be distinguished from more common types, like spirals and ellipticals the following properties:
UDGs are unusually faint despite their large size, with their stars spread so thinly across vast areas that they are barely detectable. This gives them a "ghost-like" appearance, making them difficult to observe even with powerful telescopes. They can be as large as giant galaxies like the Milky Way, yet contain only a fraction of the stars. This leads to a diffuse, spread-out structure, unlike typical galaxies where stars are densely packed.
They are believed to be rich in dark matter, with some having up to 99% of their mass composed of dark matter. This hidden mass helps explain why they can remain gravitationally bound despite their sparse stellar populations.
UDGs are found in diverse locations, from dense galaxy clusters to isolated regions of space. This range of environments suggests multiple formation pathways, such as tidal disruption, gas stripping, or failed galaxy formation.
The exact process behind UDG formation remains unclear. Some theories suggest they are “failed” galaxies that lost the gas needed for star formation early on, while others propose they were formed in massive dark matter halos, preventing further development.
www.patreon.com/astrophil
Join this channel to get access to perks:
ua-cam.com/channels/Eo5y4iVybEu7AZ1w2lJlEg.htmljoin
Welcome, my name is Phil, and in this video I discuss what ultra-diffuse galaxies are.
Ultra Diffuse Galaxies (UDGs) are a rare type of galaxy that can be distinguished from more common types, like spirals and ellipticals the following properties:
UDGs are unusually faint despite their large size, with their stars spread so thinly across vast areas that they are barely detectable. This gives them a "ghost-like" appearance, making them difficult to observe even with powerful telescopes. They can be as large as giant galaxies like the Milky Way, yet contain only a fraction of the stars. This leads to a diffuse, spread-out structure, unlike typical galaxies where stars are densely packed.
They are believed to be rich in dark matter, with some having up to 99% of their mass composed of dark matter. This hidden mass helps explain why they can remain gravitationally bound despite their sparse stellar populations.
UDGs are found in diverse locations, from dense galaxy clusters to isolated regions of space. This range of environments suggests multiple formation pathways, such as tidal disruption, gas stripping, or failed galaxy formation.
The exact process behind UDG formation remains unclear. Some theories suggest they are “failed” galaxies that lost the gas needed for star formation early on, while others propose they were formed in massive dark matter halos, preventing further development.
Переглядів: 146
Відео
Calculating Transit Duration for Transiting Exoplanets: A Step-by-Step Guide
Переглядів 96День тому
Calculating Transit Duration for Transiting Exoplanets: A Step-by-Step Guide
Could Saturn's Rings Drive Its Extreme Seasons?
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Could Saturn's Rings Drive Its Extreme Seasons?
Detecting Moons Around Free-Floating Exoplanets Using The Radial Velocity Method
Переглядів 23721 день тому
Detecting Moons Around Free-Floating Exoplanets Using The Radial Velocity Method
Detecting Moons Around Free-Floating Exoplanets Using The Transit Method
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Detecting Moons Around Free-Floating Exoplanets Using The Transit Method
Detecting Moons Around Free-Floating Exoplanets Using Astrometry
Переглядів 149Місяць тому
Detecting Moons Around Free-Floating Exoplanets Using Astrometry
Ultra-Faint Dwarf Galaxies Are Great Laboratories for Studying Dark Matter
Переглядів 245Місяць тому
Ultra-Faint Dwarf Galaxies Are Great Laboratories for Studying Dark Matter
Powerful Star Factories Reside Inside Blue Compact Dwarf Galaxies
Переглядів 80Місяць тому
Powerful Star Factories Reside Inside Blue Compact Dwarf Galaxies
Ultra-Compact Dwarf Galaxies: The Bridge Between Star Clusters and Galaxies
Переглядів 1882 місяці тому
Ultra-Compact Dwarf Galaxies: The Bridge Between Star Clusters and Galaxies
Here's How the Moon's Diameter is Calculated
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Dwarf Galaxies Explained: Are They Just Mini Versions of Big Galaxies?
Переглядів 1842 місяці тому
Dwarf Galaxies Explained: Are They Just Mini Versions of Big Galaxies?
Twilight Explained: What’s the Difference Between Civil, Nautical, and Astronomical Twilight?
Переглядів 1,2 тис.2 місяці тому
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Using Pulsar Timing to Detect Exoplanets Around Pulsars
Переглядів 2982 місяці тому
Using Pulsar Timing to Detect Exoplanets Around Pulsars
Understanding the Differences Between Astronomical Horizon and True Horizon
Переглядів 4312 місяці тому
Understanding the Differences Between Astronomical Horizon and True Horizon
An Overview of Galaxies: 3rd-Year Lecture, University of Lincoln
Переглядів 1492 місяці тому
An Overview of Galaxies: 3rd-Year Lecture, University of Lincoln
Understanding Zenith and Nadir in Astronomy
Переглядів 1,7 тис.3 місяці тому
Understanding Zenith and Nadir in Astronomy
Discovering Planetary Systems: Sample 2nd Year Lecture at the University of Lincoln
Переглядів 573 місяці тому
Discovering Planetary Systems: Sample 2nd Year Lecture at the University of Lincoln
What is the Ecliptic in Astronomy? Discover Its Celestial Significance
Переглядів 1,5 тис.3 місяці тому
What is the Ecliptic in Astronomy? Discover Its Celestial Significance
Introduction to the Hertzsprung-Russell Diagram: 1st-Year Lecture, University of Lincoln
Переглядів 743 місяці тому
Introduction to the Hertzsprung-Russell Diagram: 1st-Year Lecture, University of Lincoln
A simple guide to right ascension and declination in the equatorial coordinate system
Переглядів 7973 місяці тому
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Can You Name the Comets You Discover? An Astrophysicist Explains
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A simple guide to azimuth and altitude in the horizontal coordinate system
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Can You Name the Exoplanets You Discover? An Astrophysicist Explains
Переглядів 1143 місяці тому
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How to detect exoplanets using eclipse timing variations of binary stars
Переглядів 1133 місяці тому
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How to Calculate Orbital Velocity for Elliptical Orbits Using the Vis-Viva Equation
Переглядів 2,1 тис.4 місяці тому
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Переглядів 2214 місяці тому
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Переглядів 9444 місяці тому
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😅😅😅😅😅😅😅
are you sure this isnt uranus? hahaha
*my bday* ❤
Totally lovely. Very interesting!
Nebula pulsar: yay I'm number one
OUR BABY BOY!
Relativistic dilation explains dark matter. It is the phenomenon our high school teachers were talking about when they said "mass becomes infinite at the speed of light". This doesn't mean mass increases, it means mass becomes spread throughout spacetime relative to an outside observer. Time dilation is just one aspect of dilation, it's not just time that gets dilated. Even mass that exists at 75% light speed is partially dilated. It occurs wherever there is an astronomical quantity of mass. This includes the centers of very high mass stars and the overwhelming majority of galaxy centers. Our own galactic center is dilated. This means that there is no valid XYZ coordinate we can attribute to it, you can't point your finger at something that is smeared through spacetime. In other words that mass is all around us. It's the "missing mass" needed to explain galaxy rotation curves. Dilation does not occur in galaxies with low mass centers because they do not have enough mass to achieve relativistic velocities. It has been confirmed in 6 ultra diffuse galaxies including NGC 1052-DF2 and DF4 to have no dark matter. Mass is a clingy thing thanks to gravity, it makes sense that dilated mass would exist as a halo around galaxies.
Light Year...
Lol I search it
Its a big swirl
and by the way, that sound is edited
I just saw a cow get through the fence and up on the road! So please take it a little careful and watch out for her, you who are out driving! 👍
Crazy… i didnt know supernovas were green. And whoop, they suddenly disappear… crazy!
But this doesn't explain why tidal forces make orbits more circular... It just explains why tidal forces make them hotter.
The orbital energy is transferred to heat energy, that is what causes the circularisation. This video shows how you can calculate the amount of tidal heating, using Jupiter's moon Io as an example: ua-cam.com/video/py-y248Ny3I/v-deo.html
I have previously heard that supernovae are so bright that they light up the entire night sky. I did not discern any change in the intensity of this supposed supernova. This must be a nonsense post!
Yes, it's all just trick footage
Debris
These supernovas are the Langoliers of space. They eat up galactic civilizations to make sure they cannot contact each other.
That thing is huge! If there was any civilization nearby, they are doomed.
So proud my Dad worked on NEAR and MESSENGER at APL. Very cool to see this and remember his work.
This is literally a void meme but is not a meme
Sir, if you could, please show the way for us to derive that equation as well.. it can make us understanding the lesson way easier✨✨ Thank you so much for today's lesson and video❤
glupeibas
glupeibas
Is that the enterprise from Star Trek lol
Thank you this formula is very easy to understand, i am not good at math, and i dont know physics but i am taking an astronomy class and this simplified finding eccentricity for me.
@Izzybell_95 Thank you, great to hear you found it helpful
Thank you @AstroPhil2000. This is remarkable. I'm awestruck !! How many sentient civilisations could there be amongst them? Possibly a billion years more advanced than us.
Σωστά! Καί χρειάζονται ΑΚΌΜΗ ένα δισεκατομμύριο χρόνια νά μπορέσουν νά μάς επισκεφθούν! 😢
A world without politics. Refreshing
Fake
Эт кто ж так красиво рисует!?
Splendide 🔭🌞😃👍
I really wish I owned a 🔭 I love to see space
Whoa plenty Galaxies Are we one them?
Not one of those but ours is barred spiral galaxy which we can't easily see as we are inside it
The real pictures taken with are satellites we have cameras telescopes whatever we got a lot of picture taken in i space?
2117 is the next date this will happen some of yall be on here so heavy you forgot google was a thing
Truly amazing seeing just how vast our universes are 🏴🙏🏴
Humungous amounts of energy behind that sound
Man thank you so much, I finally understand how red giants get so big, people always try to explain it but make it too hard for no reason. Thanks!
@TatianaHD Thank you, glad it made sense!
PHIL YOU HAVE SAVED MY ASTRO HOMEWORK
@user-xg5dw2gm8f Thanks, glad the video was helpful!
in what distance unit is the semi-major axis in?
It can be in any distance units. Whatever units you use for semi-major axis, it will be the same for the Hill radius. Common to use AU, m or km though.
Космос это фейк!
THE BLIND LEADING THE BLIND ??? Unless you comprehend the major "Electrical nature of Saturn" and realistically are a qualified member of the IEEE (Institute for Electricity) you will be talking "Nonsense". There is well known electrical interaction between Saturn's Rings, and the planet itself as is also the situation between Jupiter & its Rings. All of which is well understood by various Members of the IEEE, including Professor Donald Scott, a highly qualified Electrical Engineer . Indeed these Scientists have just turned the daft "Gravity Model" on its head again, by revealing Discoveries (and the proof) that our Sun is in reality functioning Electrically, and like ALL Stars "Burns NOTHING at all, as even a decent Chemist will tell you. (Stars have the wrong type of "Atmosphere" to even allow "Flames") Indeed "Fire" is only possible in this Solar system (currently) on Earth , unless Elon Musk can terraform Mars' atmosphere ! NOTE: You will find a number of Documentaries by Professor Donald Scott, on the "Thunderbolts Project" expansive website. As well as programmes from Dr. Michael Clarage and Electrical Radio Astronomer, who was a leading Scientific advisor to AUREON ENERGY Ltd. Who's new radical technology, the Plasma Reactor Generator (PRG) is the visual proof our Sun functions electrically. And all that Companies incredible Scientific Electrical Discoveries, about our Sun. Along with the PRG machinery is PATENTED, and already in Commercial use Remediating Lethal Radiation !
da saludos estamos misma estrella
Невероятно, сотни галактик на таком крошечном участке неба и в каждой сотни миллиардов звезд по любому кто-то там живёт
İng
✨
FASCINATING
Everyboody* no one can know this
AstroPhil you are the reason i passed astronomy class and graduated high school. Thank you.
@notmrchubbsta Congratulations and thank you, so glad that you found the videos helpful!
Poor Philae 😢
Thank you!! my astronomy class is online and this is SO helpful
@@ariram407 so glad you found it helpful!
Double split black hole ,just didn't split till observed