Do aliens exist

[Terror]

hmmm perhaps

[Dunenewt]

What do you mean perhaps its scientific proof

[Anathema]

I don't see how life could have begun without sunlight- unless the first lifeforms would take their energy from geothermal energy, like geysers.

[Acriku]

The Sun is vital! Without the sun everything will be stonecold (steveaustin) and no life can develop under such circumstances. Maybe very very simple organisms but that's as far as it goes.

[nemafakei]

Without the sun, there is no source of energy. No source of energy means no life.

[Acriku]

Well bacteria can travel on asteroids frozen, from another more habitable planet, and crash into a planet with no sun to orbit around...

[Edric O]

You do realize that the temperature on such a planet would be extremely close to absolute zero, don't you?

[Acriku]

Mine? Too bad absolute zero is theoretically impossible :( Or else I could have the coolest planet.

[nemafakei]

They can travel frozen, but they can't do anything until they're unfrozen.

I reckon 6K (-267

[Terror]

Acriku is right though, Bacteria were found on asteroids. and asteroids can be very close to 273 degrees celcius under 0

[Acriku]

Of course nema, but still technically there would then be life..

[Edric O]

...life in suspended animation.

[nemafakei]

There would - but you must explain whence it came.

[Caid Ivik]

Acriku is right though, Bacteria were found on asteroids. and asteroids can be very close to 273 degrees celcius under 0

But only dead fossils. Possibly when a meteor hit Earth (or Mars, Europa... ::) ) some were blowed to space.

[Anathema]

Theoreticly it's possible though. Bacteria are pretty tough creatures. They even found bacteria inside volcano craters.

[Dunenewt]

Without the sun, there is no source of energy. No source of energy means no life.

No, take the sponges that live at the bottom of the sea for example they receive no light

They get their energy from chemicals

[Dude_Doc]

Absolute zero does not exist. Sure, we can freeze the universe, theoretically, but still, the atoms would continue to "live". If we would freeze all atoms, the universe would collapse... and that's what's going to happen: TOMORROW!!! Hahahaha...

[Terror]

Without the sun, there is no source of energy. No source of energy means no life.

No, take the sponges that live at the bottom of the sea for example they receive no light

They get their energy from chemicals

well, but it isn't that cold there. i mean. Molecules don't move at - 273 degrees celcius. Blood and any other fluid would become solid. So a star is needed, no matter what. Unless ofcourse you have technology to warm things up. But only humans have that, as far as we know

[TMA_1]

You have a point about the sun nema but there are creatures who are chemoautotrophs. They take sulfer and other chemicals to produce ATP molecules. They live near thermal vents which give off extreme heat. So the sun isnt always needed. Also the meteor that was found with "bacteria fossils" is extemely in question. They don t know if it is true bacteria. Most likely scientists say, it is a natural rock formation. Bacteria leave a different kind of fossil then what was found in the meteor.

[nemafakei]

Ah, but where does the energy for the thermal vents come from? If the sun never happened, planet cores would be no more than (at a guess) 100K (-173

[Dunenewt]

Bacteria-fossils have also been found on Mars

[TMA_1]

well in evolutionary standpoints, without the sun, no planets would form. so the sun is extremely important.

[nemafakei]

There's no necessity for a sun to form - just a few planets. It's hard to prove this by example, because this type of system is cold and dark...

[Caid Ivik]

But what will cause matter to form into planetoids? There is needed one larger gravity point.

[Acriku]

Just find some really big rocks formed from colliding asteroids and call them planets?