Lifecycle of massive stars | Stars, black holes and galaxies | Cosmology & Astronomy | Khan Academy

Lifecycle of Massive Stars. Created by Sal Khan.

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!

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[RubberOnRock]

It was once said, although I cannot quite remember who said it, miht even have been an astrophysics lecturer "High mass stars are like rock stars, they live fast, die young and leave interesting bodies!!"

[TheMrNomadus]

Who the fuck disliked this? I'd find him and force to study the whole astrophysics course.

[superdau]

@superdau
clarification: the layers have to do something with density, but not with the densities we are used to.

[zaxtor]

Iron kills the star because it drains the star and when the Iron reaches about 1.4 solar masses and then the star collapse.

I heard once it goes supernova the Iron core will form new elements.

[CGriffo]

I have a question, if Neon has a higher atomic number than Oxygen, why is it in the shell further out?

[Omni]

So weird I've always had endothermic in my mind as a chemistry word, but of course it works in nuclear fusion as well.

[sonyaharris]

Sorry if I am a little confused in my work and thinking of hubbles law this my first adventure in learning hubble's law. Thanks!❤😂😮😅

[superdau]

@dalcde
Oxygen burning happens after Neon burning, because it requires higher pressure and temperature. So it has to be inside the Neon shell. The layers don't have to do anything with density or weigth.

[TomFynn]

@ShaheemA13 Not as fusion generated photons as in stars, but thermal emulsion from the surface, synchrotron radiation from their rotating magnetic fields and X-Ray emission from matter falling in from a possible accretion disc formed from remnants of its original sun.

[rolitobeduya]

can you make a plant and animal life cycel vidio

[chissstardestroyer]

So, regarding when a supermassive star begins to make Iron, then it has only mere hours to live, eh, before it goes completely supernova and is gone from effective existence, or is our astronomy understanding backwards therein?

[gur]

@INMATE2468 yeah because they use up(burn) their energy(helium) faster!!. than less massive stars.

[sonyaharris]

❤ I . This video and would love to email you. Do believe we are further away than we believe in 1% +-4 on a grid paper and expanding in all directions. And we actually are further in time and distance than we realize and already living in the future? We may be in the actual future? In eternity already and the overwhelming of the according to hubble's law and the megasperes are further in distance than time. The is 1st time i have tried learn about quantum mechanics how far we actually are in univers. Thanks!❤😂

[INMATE]

So the bigger they are the faster they die????