Black holes | Stars, black holes and galaxies | Cosmology & Astronomy | Khan Academy
About | Information | History | Online | Facts | Discovery
Black Holes. Created by Sal Khan. Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/stellar-life-topic/stellar-life-death-tutorial/v/supermassive-black-holes?utm_source=YT&utm_medium=Desc&utm_campaign=cosmologystronomy Missed the previous lesson? https://www.khanacademy.org/science/cosmology-and-astronomy/stellar-life-topic/stellar-life-death-tutorial/v/supernova-clarification?utm_source=YT&utm_medium=Desc&utm_campaign=cosmologystronomy Cosmology & Astronomy on Khan Academy: The Earth is huge, but it is tiny compared to the Sun (which is super huge). But the Sun is tiny compared to the solar system which is tiny compared to the distance to the next star. Oh, did we mention that there are over 100 billion stars in our galaxy (which is about 100,000 light years in diameter) which is one of hundreds of billions of galaxies in just the observable universe (which might be infinite for all we know). Don't feel small. We find it liberating. Your everyday human stresses are nothing compared to this enormity that we are a part of. Enjoy the fact that we get to be part of this vastness! About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content. For free. For everyone. Forever. #YouCanLearnAnything Subscribe to Khan Academy’s Cosmology & Astronomy channel: https://www.youtube.com/channel/UChNPnEkW8LYZ5Rwi8_A2-DA?sub_confirmation=1 Subscribe to Khan Academy: https://www.youtube.com/subscription_center?add_user=khanacademy
Comments
-
Can the fusion of black holes observed tell us something about what lies beyond the event horizon?
-
:)
-
THANK YOU SO MUCH! I might not fail astronomy now!
-
Cosmos a spacetime Odyssey
-
WOW
-
blows my mind...
-
I was chating with my dad while he scrolled down your channlle: he was watching your vid on kidneys... I saw this and i'm like: "whoa!!!! i'm going to watch that!" and here I am
-
OMG IS THERE ANYTHING YOU DON'T KNOW??!?!?!? Hahaha, you're in so many of these videos!
-
...is when a binary star system has a white dwarf that gravitationally "steals" matter from it's sister star, usually a red giant, until it then reaches the Chandrasekhar limit and is no longer supported by electron degeneracy pressure, therefore causing it to collapse into a supernova. The usefulness of these nova is they are always exactly the same brightness and are used as standard candles to measure galactic distances.
-
The Chandrasekhar limit still applies, however this assumes there are no other outward pressures to balance the gravitational collapse. For example, a 5 solar mass star, a mass which exceeds the limit, would be balanced by the outward thermodynamic pressure resulting in hydrostatic equilibrium. Upon the death of that star, it would likely have burned and ejected enough material to create a white dwarf below the Chand. limit and not evoke a supernova. The exception, the Type Ia supernova...
-
I love you.
-
Hi Mister, just wanted to ask how does the Chandrasekhar limit (1.44 times Mass of Sun) links to this topic? Btw awesome video =)!
-
Black Hole = A Star that's gone to the dark side of the force.
-
Space-time curvature. The "path" of the light gets distorted.
-
Knowledge is NEVER pointless ;)
-
By the curvature of spacetime ( general relativity)
-
If gravity is an interaction between two massive objects, and photons, particles of light, are massless particles (that's the reason why they can travel at speed of light), why does light gets pulled by the gravity of a black hole?
-
did you ever do videos on the microscopic black holes all aroud earth?
-
You just blew my mind :O
-
Im just impressed on how well sal can draw circles, top job Sal.
10m 9sLenght
618Rating