Detectable civilizations in our galaxy 3 | Cosmology & Astronomy | Khan Academy
About | Information | History | Online | Facts | Discovery
Reconciling with the traditional Drake Equation. 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-4?utm_source=YT&utm_medium=Desc&utm_campaign=cosmologystronomy Missed the previous 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 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
-
So i don't agree to not take into account all life that was created before 10B years ago, because if they lived long enough, they would have been able to move to a solar system that is still in the currect 10B lifetime range.
-
The Drake Equation seems to me a bit like a Dating Site.
-
astrobiology
-
@MoOtJeMan Translating: While relying on human science, you will never know. I see...
-
@marcelobetel theory comes before practice, so with the assumptions of these stars are made so that in future it will be disproven by new evidence made by observation and that will be disproved by other evidence and that will be the basis for a new theory and it'll go on until we can prove it by heading in space ships ;)
-
I don't know if I am getting this explanation right, but, what's the point of all that measures and assumptions if they are only assumptions with no proves ata all, anyway? I mean, the probability of a single protein exists by accident is less then a man fly by himself...
-
GREAT VID KHAN CAN U PLEASE EXPLAIN THE BIG CRUNCH TOO!!! UR THE BEST BRO
-
You could do an equation like that for a person finding someone compatible to spend a happy eternal marriage with XD I bet the fraction for each person is tiny!
-
Hmm, so why does the traditional Drake equation use rate of star formation rather than number of stars/average lifespan? First, the rate of star formation is nowhere near constant; it was most faster in the past in our galaxy. Second, isn't it easier for us to figure out that average lifespan of a star and the number of stars in our galaxy than it is to calculate star formation? The formula you derived seems easier to work with.
7m 18sLenght
113Rating