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Brittonにより編集済み:
6/1/2015 10:16:51 PM
335
There are potentially over 8 billion planets capable of life
There is potentially over 8 [b]billion[/b] planets capable of life in [b][i]our galaxy.[/i][/b]
[quote] By extrapolating Kepler’s findings, astronomers have come up with some not-altogether-unfounded estimates for these values. For instance, they concluded that about 22% of Sun-like stars has at least one planet we class as potentially habitable. Doing the math based on the latest estimates for the total number of stars in the Milky Way, that gives us a rough figure of 8.8 billion potentially habitable planets in the Milky Way. That’s a lot of rolls of the dice, assuming you believe life has any chance at all of starting spontaneously. [/quote]
That's just our galaxy people. There's hundreds of billions of galaxies in our universe. That's a lot of potential for life. We're not special snowflakes.
[url=http://www.extremetech.com/extreme/170404-kepler-20-of-sun-like-stars-have-habitable-planets-alien-life-drake-equation-finally-has-a-leg-to-stand-on]source[/url]
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Isn't it also quite probably that quite a few of these planets have met their demise between the time of when we view them and the time it took for that information to reach us? I'm sure there are plenty of planets left and new that would fit these specification of life supportableness, but just something to think about.
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9 通の返信Mr Mulberryにより編集済み: 4/23/2015 1:49:41 AM[quote]Look again at that dot. That's here. That's home. That's us. On it everyone you love, everyone you know, everyone you ever heard of, every human being who ever was, lived out their lives. The aggregate of our joy and suffering, thousands of confident religions, ideologies, and economic doctrines, every hunter and forager, every hero and coward, every creator and destroyer of civilization, every king and peasant, every young couple in love, every mother and father, hopeful child, inventor and explorer, every teacher of morals, every corrupt politician, every "superstar," every "supreme leader," every saint and sinner in the history of our species lived there--on a mote of dust suspended in a sunbeam. -Carl Sagan[/quote] This photograph of planet Earth taken on February 14, 1990, by the Voyager 1 space probe from a record distance of about 6 billion kilometers (3.7 billion miles, 40.5 AU) away from earth. Earths apparent size is less than a pixel. Your thread reminded me of this quote.
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8 通の返信But how many factors are they really taking into account? In addition to being at a good distance from the sun, good size, good rotation speed, good chemical composition, and good temperature earth has going for, there are also things like how the moon stabilizes the environment, and Jupiter deters comets and asteroids away from earth. There's probably a few hundred I can name, but you get the idea. Sure, you could say that life works the way it does because of those conditions, but the point is we don't actually have evidence of it being able to work any other way. Not that I wouldn't like the idea of a universe filled with life.
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6 通の返信I hope the first planet we discover with life is amazing like trees everywhere and waterfalls. I think humanity could use the encouragement
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14 通の返信I believe alien life is quite common in the universe, although intelligent life is less so. Some say it has yet to appear on planet Earth. - Stephen Hawking
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6 通の返信My theory of life is that our ancestor may have escaped a planet or come here in search of a habitable planet so there is lifeforms of our own out there. And we are this way because we adapt to this planet when our ancestors were different
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2 通の返信Tormented_Anusにより編集済み: 7/19/2015 2:43:48 PM
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