Star field and nebula images | Cosmology & Astronomy | Khan Academy

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Star Field and Nebula Images. Created by Sal Khan.

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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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Paulo Andre Azevedo Quirino says:

Aren't the stars red in the star field because they are moving towards us? Doppler kinda i saw that in another context… But can't that be the case?

Morne Du Plessis says:

In the video you said that the light left the eagle nebula 7000 years ago, because it is 7000 LY away. Isn't it less than 7000 LY away and because the universe is expanding it seems 7000 LY away?

fgsasah says:

But what of Juzlo's right to express himself?

Urine tiger says:

alright, coming from someone who is not religious in the slightest, was that really necessary? If he wants to believe God made this all, and express himself, just let him

iNDIGO says:

Nevermind about that pillar, You said it probably doesn't exist anymore.
SMH, science!

iNDIGO says:

You said that pillar is 7 light years tall.
How does someone get info on know that??
Wouldn't you have to measure it at all angles, to make sure its not as wide as it is tall?
if that makes any

Ashraf Mughal says:

And when the heaven splitteth asunder and becometh rosy like red hide [Q,55:37] pickthall translation published around 1917

Nate Jones says:

at like….6:20 is that the helium blast?

IntoTheLight7777 says:

which is approximately 24,500,000,000,000 miles away!!!!!!!

lemons181 says:

Alpha Centauri?

Lloyd Chaffey says:

I'm sharing your videos on facebook, I love them

Lesca says:

red stars could be a nearby red dwarf! also there really arnt any green stars. not something i could explain very well though

jayce luck says:

@eliot0x103 well it is the nearest star…. but if u mean excluding our star then the nearest is Proxima Centauri and its more close to about 4.5 light years away.

tanhuiz says:

I see.. thanks. I must have missed it.

Eliot says:

@tanhuiz Just as what is said in the video; Nearest star = closest to Earth but excluding our Sun in this case.

tanhuiz says:

What do you mean by "nearest star", is it another galaxy or something?

Womp says:

@silencedfable Astronomy, please. Astrology is horoscopes and more BS.

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