Black Holes: Crash Course Astronomy #33
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We’ve covered a lot of incredible stuff, but this week we’re talking about the weirdest objects in space: BLACK HOLES. Stellar mass black holes form when a very massive star dies, and its core collapses. The core has to be more than about 2.8 times the Sun’s mass to form a black hole. Black holes come in different sizes, but for all of them, the escape velocity is greater than the speed of light, so nothing can escape, not matter or light. They don’t wander the Universe gobbling everything down around them; their gravity is only really intense very close to them. Tides near a stellar mass black hole will spaghettify you, and time slows down when you get near a black hole — not that this helps much if you’re falling in. Crash Course Astronomy Poster: http://store.dftba.com/products/crashcourse-astronomy-poster -- Table of Contents How Stellar Mass Black Holes Are Formed 1:03 The Core 1:43 Nothing Can Escape Once It’s Inside 2:29 Gravity Intensifies The Closer You Get 3:33 Spaghettification 6:01 Time Will Slow Down Near A Black Hole 8:01 -- PBS Digital Studios: http://youtube.com/pbsdigitalstudios Follow Phil on Twitter: https://twitter.com/badastronomer Want to find Crash Course elsewhere on the internet? Facebook - http://www.facebook.com/YouTubeCrashCourse Twitter - http://www.twitter.com/TheCrashCourse Tumblr - http://thecrashcourse.tumblr.com Support CrashCourse on Patreon: http://www.patreon.com/crashcourse -- PHOTOS/VIDEOS White Dwarf Pulses Like a Pulsar http://www.nasa.gov/centers/goddard/news/topstory/2007/whitedwarf_pulsar.html [credit: NASA, Casey Reed] Swift Reveals New Phenomenon in a Neutron Star http://www.nasa.gov/mission_pages/swift/bursts/new-phenom.html#.Vc4isflVhBd [credit: NASA's Goddard Space Flight Center] Black Holes - Monsters in Space https://en.wikipedia.org/wiki/File:Black_Holes_-_Monsters_in_Space.jpg [credit: NASA/JPL-Caltech, Wikimedia Commons] What if the Sun became a black hole? (artist's impression) http://www.spacetelescope.org/videos/hubblecast43g/ [credit: ESA/Hubble (M. Kornmesser)] Black Hole Animation http://chandra.harvard.edu/photo/2003/0203long/animations.html [credit: NASA/SAO/CXC/D.Berry] Star Destroyer http://svs.gsfc.nasa.gov/cgi-bin/details.cgi?aid=11065 [credit: Space Telescope Science Institute (STScI) and NASA's Goddard Space Flight Center] Black hole deforms space http://www.spacetelescope.org/videos/hst15_blackhole_grid/ [credit: ESA/Hubble (M. Kornmesser & L. L. Christensen)] Black hole close-up (artist's impression) http://www.spacetelescope.org/videos/heic0211c/ [credit: European Space Agency, NASA and Felix Mirabel (the French Atomic Energy Commission & the Institute for Astronomy and Space Physics/Conicet of Argentina)]
Comments
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BLACK HOLE
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Laugh
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If black holes emit no light, why do they look bright at center of say the milky way?
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Something I've wondered... If, when falling into a black hole, you see all of time pass for the universe, wouldn't that also include the time it takes for the black hole to evaporate?
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can our soul ascape a black hole??
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Look at my name.
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Cool 😃
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OK HES FINE LOL. spaghettification lol!!
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Great, YouTube unsubed me from these guys
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1:30. You need to specify the distance. If you're at the other side of the observable universe, quantum fluctuations should be able to provide enough energy to escape even the massest of black holes.
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Cool. So what would happen if two black holes got close enough to each other to start sucking into each other?
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0:50 WTF
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If you could take a Plank from near or inside the EH and compare it to a Plank somewhere between galaxies, would they be unequal?
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black holes may be scary, but they will also be the last bastions of order at the end of time
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Please teach something about white hole speculations like another episode.
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Does a black hole act like a pinhole camera?
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what if you threw a nokia 3310 into a black hole?
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I love Phil! I have seen him on some other specials on PBS and Discovery Channel and such, really like his explanations and these videos! I'm a freshman in college and I have an astronomy final today THANK YOU PHIL AND THANK YOU CRASH COURSE AND THANK YOU COFFEE
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What gluttons. Save some for me.
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