Earth was born dry until a cosmic collision made it a blue planet
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Re: Earth was born dry until a cosmic collision made it a blue planet
#2Ah the First Impact
Re: Earth was born dry until a cosmic collision made it a blue planet
#3All life on Earth is illegal immigrants from another planet.
Re: Earth was born dry until a cosmic collision made it a blue planet
#4This could mean in the Drake equation ne -number of planets capable of life- is very small. A planet has to be hit with a comet big enough to deliver a large amount of water but not so big or fast to destroy it. And be in the Goldilocks zone of the star. Also the mass of the planet would play a part - gravity of more massive ones would be more likely to capture a comet. But again, too massive and I could see that hampering life.
Re: Earth was born dry until a cosmic collision made it a blue planet
#5How does this square with the fact that we have solid evidence of water on Mars as well?
Re: Earth was born dry until a cosmic collision made it a blue planet
#6Imagine this sci-fi plot twist:
Aliens make live habitable by hitting proto-Earth with a planet, so life can sprout there.
They calibrated it such a way that angular size of Moon is the same as of Sun.
Re: Earth was born dry until a cosmic collision made it a blue planet
#7This could mean in the Drake equation ne -number of planets capable of life- is very small. A planet has to be hit with a comet big enough to deliver a large amount of water but not so big or fast to destroy it. And be in the Goldilocks zone of the star. Also the mass of the planet would play a part - gravity of more massive ones would be more likely to capture a comet. But again, too massive and I could see that ham…
Unless collisions like the article suggests are a statistical inevitability, that is.
Re: Earth was born dry until a cosmic collision made it a blue planet
#8How does this square with the fact that we have solid evidence of water on Mars as well?
Having some water and having lots of water is a slight difference. The most arid dessert on earth is a jungle compared to Mars.
(Also Mars could have been also hit.)
Re: Earth was born dry until a cosmic collision made it a blue planet
#9All life on Earth is illegal immigrants from another planet.
Only if the earth was seeded with life.
Re: Earth was born dry until a cosmic collision made it a blue planet
#10This could mean in the Drake equation ne -number of planets capable of life- is very small. A planet has to be hit with a comet big enough to deliver a large amount of water but not so big or fast to destroy it. And be in the Goldilocks zone of the star. Also the mass of the planet would play a part - gravity of more massive ones would be more likely to capture a comet. But again, too massive and I could see that ham…
Unless collisions like the article suggests are a statistical inevitability, that is.
Hydrogen is the most common element in the universe. So long as you have elemental oxygen, it will react with things and hydrogen is the thing it will react with the most. So having water is almost a given for any Star system. Additionally, protoplanet and cometary collisions are in fact statistically inevitable. The real question is if water can be delivered at a point after enough gravity has amassed to ensure the water stays there.