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Questions tagged [origin-of-life]

For questions about how a species, or life in general, was created.

9
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3answers
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Appropriate liquid/solvent for life in my underground environment on Venus

Partly inspired by this question My Venusians are happy in their cloud top city when a small group somehow (with lots of handwaving) crashes to the surface, falls underground, and ends up in a hidden ...
4
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1answer
107 views

Would life be possible on a planet that has an axis of rotation that always “pointed” directly at the sun? [duplicate]

Preface: I'll be calling call the orbit described in the question title a "solar-oriented orbit" for the sake of convenience, as "a planet that has an axis of rotation that always pointed directly at ...
-1
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1answer
109 views

Asteroids with an atmosphere

What would be the likelihood of an asteroid developing a thin layer of gas? If an asteroid is capable of having an "atmosphere", then how likely would be be for primitive plant life, such as a moss, ...
4
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1answer
222 views

Origin of life on a waterworld

Take a planet like Gliese 1214 B, which has no land, an ocean 100s of kilometres deep and a seabed of Ice VII. For the purposes of the question, let's assume that the pressure and/or temperature near ...
4
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2answers
169 views

Getting energy in the oceans

We know that as a planet increases in size, its surface gets covered by oceans (more water is captured by gravity and shape is more spherical). Therefore, a planet larger than Earth can not have a ...
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0answers
247 views

What was life like on Theia [closed]

In a reality where life on earth had originally arrived on this planet due to the effects of a collision between Gaia and Theia, which later formed the earth and moon as we know them today, what would ...
0
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2answers
150 views

Advice on establishing a magical ecosystem? [closed]

A huge cataclysm struck the world several thousand years ago, in which debris from magical meteorites basically screwed up the whole planet, altering its ecosystems to include creatures that evolved/...
1
vote
1answer
246 views

What would a life form that evolved in deep space and without gravity look like? [closed]

Somehow the following hypothetical life form evolved in deep space with a long lifetime. It lives in a low orbit around massive stars, reproduces by eating interstellar gas and dust and uses the ...
2
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5answers
200 views

Planet and Moon with life [duplicate]

I want an earth-sized planet with a moon-sized moon to both have complex, possibly intelligent, life. Would it be more realistic for life to develop separately on each body or for life to transfer ...
1
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3answers
132 views

How would an alien race that seeded life on a planet let their presence be known at a certain point in time?

Imagine an advanced alien race that seeded a planet with species capable of written communication. While the alien race is on the planet for a few generations it wants to remain mostly hidden from the ...
12
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3answers
445 views

Can life arise on a brown dwarf?

Brown dwarfs are celestial bodies in the gray area between planet and star. They're huge, gaseous, hot compared to planets, and come in all different kinds. (1) Is it possible for life to develop in ...
23
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5answers
4k views

Life from a dead space whale

Let's take our regular "Great Blue Star Whale", with a mass of about 10 000 tons. That poor, poor whale is reaching the end of its life for whatever reasons. (Damn you! Space whale hunters!). It will ...
10
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3answers
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What would be the consequences of a world that has only one dominant species of non-oceanic animal life?

I have a world that has unexpected lifeforms detected. There are to-be-revealed reasons for it, but the way the ecosystem is set up is: Microbial life is abundant everywhere There is a single ...
15
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12answers
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Would you shoot out DNA onto baby planets if you planned to visit it someday?

The question popped into my mind when I read this. Since we know our scientists are searching for planets which might be capable of supporting life; most of them many light-years away, could the ...
1
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4answers
136 views

Roots of an intelligent alien digital life form [closed]

A fully intelligent digital life form that does not have a "body" directly; but live inside a very complex datacenter network; and communicate other life forms via robots, terminals, computer screens, ...
1
vote
4answers
293 views

The first vampires [closed]

How would the 'vampire virus' come about? Assuming vampires can turn others into vampires with a literal infection. How can the origin of the virus be explained considering that is in a viruses best ...
7
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3answers
231 views

Can life be powered by thermal conduction?

I have a world in mind that is essentially a planet-wide underground ocean. The planet doesn't have a strong magnetic field, so radiation on the surface is too high to allow life, but what I'm ...
12
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5answers
1k views

A planet made of iron

Our planet has a surface full of silicates and a core made of iron. It's due to this that Earth is the way it mostly is - most rocks and many minerals contain some form of silica. But what about a ...
8
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3answers
448 views

Planetary Habitability at twelve to seven billion years ago

Following this question, I had additional question of habitability. Assuming that life could exist on planet formed roughly twelve billion years ago, allowing complex life to exist as of seven billion ...
4
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2answers
259 views

Life under the surface of Ganymede

Inspired by this article about the recent discovery of a subsurface ocean. So now we know it has a liquid water ocean and a magnetic field. The subsurface ocean is also protected from radiation by ...
13
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5answers
1k views

Could intelligent life on Earth have been seeded by precursor aliens?

This idea comes up quite frequently in science fiction, but there has not been a question about it yet on Worldbuilding.SE. Is it possible that intelligent life was brought to Earth by an alien ...