Questions tagged [origin-of-life]

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Chances of life on other planets, how watertight is the idea that 'As soon as life could occur, it did occur’?

I’ve heard it reasoned that ‘Almost as soon as life could occur on Earth, it did. Therefore it seems likely that life develops easily, and thus that there’s probably lots of life out there’. Is this ...
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19 votes
1 answer
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Serious alternate form of the Drake Equation, or graffiti?

Where I live it is very common to see jackets and T-shirts with familiar yet casually garbled or modified content (example) I recently spotted what looked a lot like the Drake equation on the back of ...
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2 votes
4 answers
275 views

Why haven't detected life in the universe?

It would seem that if life were relatively common in the universe that there would be a cacophony of noise somewhere in the electromagnetic spectrum. Is life so rare and distant that the waves haven't ...
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3 votes
2 answers
437 views

What if we are looking for the wrong signs of life on other planets?

I am by no means an astronomy expert, having only taken 2 semesters in college. But I am an avid follower of news reports that look for signs of life on other planets. Today it was announced that 20 ...
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18 votes
4 answers
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Did the earth form outside the solar system?

Why isn't it possible that the earth formed outside the solar system and got attracted later by the Sun? I just need arguments to defeat this hypothesis.
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2 votes
2 answers
270 views

What planets and moons have we seeded with life (if any)?

Which planets and moons have we accidentally (or purposely) seeded with life? I would expect this to be any planet or moon we have sent an unsterilized (or not fully sterilized) lander to, or crashed ...
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14 votes
4 answers
1k views

If we found evidence of life on Mars, how would we know that it originated on Mars rather than Earth?

Consider this scenario. One of the probes sent to Mars either very soon, or within the next century, finds conclusive micro-fossil evidence that life once existed on Mars. One theory today that is ...
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  • 365
2 votes
1 answer
105 views

Is liquid water on Mars such a big leap compared with ice?

I thought we have found bacteria or other kinds of life on Mars. Now it is liquid water. Is there such a big difference between liquid water and iced water?
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0 votes
2 answers
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Accidental or deliberate? [duplicate]

We know that the visual size of the Sun and Moon from the Earth in our lifetime (!) is nearly equivalent. Now my question: Is this event is random? Or have a scientific reason? For example, maybe ...
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4 votes
1 answer
210 views

Why did Earth need material from comets to assemble the raw materials for life?

It's often speculated that matter from comets played a crucial role in the development of life on Earth. For example, Maps of Time says, Many of the ingredients of the early atmosphere (including ...
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  • 359
8 votes
3 answers
400 views

How should one rationally deal with the issue of space travelling alien civilizations?

What kind of reasoning is appropriate to understand the as of today unanswered question of whether there are (other) interstellar space travelling civilizations in the Milky Way? We have already sent ...
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