Detectable civilizations in our galaxy 1 | Cosmology & Astronomy | Khan Academy
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A framework for thinking about how many detectable civilizations are out there. Created by Sal Khan. Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/life-earth-universe/life-in-universe-topic/v/detectable-civilizations-in-our-galaxy-2?utm_source=YT&utm_medium=Desc&utm_campaign=cosmologystronomy Missed the previous lesson? https://www.khanacademy.org/science/cosmology-and-astronomy/life-earth-universe/measuring-age-tutorial/v/k-ar-dating-calculation?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
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finding another galaxy where we saw evidence of Radio waves and satellites would be Fucking massive in the news. (well can't say that since solar sails launched the speed we can travel ahead by like a few hundred thousand miles an hour, and that never made headlines)
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if they knew about Al Yankivick they would say "we're just technologically impared"
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i hate google+ comments
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In what way does this teach anything? Other than what a multiplication is...
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I thought our Milky Way galaxy has an estimated 200 million stars... You said 100-400 billion stars at the beginning?
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LOL Alf!
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Small corrections: (1) Earth's core is not rocky - He meant rocky surface. (2) Our sun will not go Supernova but will swell, die, and collapse into a dwarf. Only a small percentage of stars are large enough (Betelgeuse). I haven't seen the other videos on these topics but they are probably in there.
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What about moons and sub-moons
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You must be pretty stupid if you can't tell.
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They found life. On Europa
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Nothing large, just microbes...
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Thanks, Kahn. Not for being a genius, but because you're generous with your genius.
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@Dewdaahman There is a theory that fish like life exist in Jupiters moon Europa. A satelite is visiting Europa in 2016 to investigate.
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@sask523 btw, you also said "that nature feeling.." what is that..? I obviously didn't get the memo.. look at my nose, there is no ring in it.. please don't be lead around, by the nose, by those that mean you harm.. look at the motives of a person, group, etc that say something and refuse to support their claims via a shread of evidence..
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@sask523 you said "about life in the universe.." there is life in one part of the universe that I've been shown, right where I stand.. if you know about life on other planets then all I ask is that you show them to me.. let me hear them speak.. just a peek is all I ask, is that too much..? as Moe used to say on the 3 Stooges, "just a few syllables.." lol.. prove it or keep it to yourself, please.. you can keep it your own little secret..
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@Dewdaahman And i really thought that people with an attitude like you dont excist annymore,if you dont have that nature feeling about life in the universe than i feel sorry for you..
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@RIFtrage those who resort to name calling have proven that they cannot support their position.. name calling = juvenile..
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@sask523 show me.. life means living, right..? show me something, someone living anywhere other than the planet earth, would you..? can you..? if I tell you I have a 7 legged dog you'd want to see it, no..? what if I said I have a 7 legged dog but I'm not gonna show it to you you'd tell me have another toke ya bafoon, would you not..?
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@Dewdaahman trollface.jpg
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@Dewdaahman Your first comment fits my standards.
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