Why life cannot exist on other planet?

Answer 1

Mercury: Too close to the sun.

Venus: Hell in the form of a planet.

Earth: Perfect climate conditions, oxygen in atmosphere, etc.

Mars: Cold; uncertain if survival is possible on this planet.

Everything else is just way too cold.

Aside from all that are the rigors of space. Nuclear radiation bathes almost every square inch of the solar system corrupting the DNA of living things. Most planets aside from gas giants or the Earth don't have Van Allen belts which filter it out. Another point is that gravity is a requirement to keep our bodies operating healthy and how much gravity is enough is still an issue for debate.

Answer 2

It is not possible to live on other planets because there is no oxygen for humans to live. We would also need abundant water, plants, other animals, a reasonable amount of gravity, and the right temperature.

A planet would need a mixture of gases with a good ratio for breathing. We need maybe 30% oxygen and about 60% nitrogen. The nitrogen is inert and thus not a poison as long as there is enough oxygen.

Answer 3

It is entirely possible for life forms to exist on other planet. However, we are so lucky with our placement in the galaxy (Distance from the sun) so we can survive here on Earth. The chances are that there is a planet around the same distance from a star as Earth is. They might not be the very intelligent though, e.g. they could be still in the prehistoric period right now (Dinosaurs). Or they could be very intelligent but haven't discovered light speed yet, like us.

Additional comment to the very good answer above:

Actually, there is no reason to assume that life is not possible on any other planet. In fact, on any planet, or moon of a planet, which is warm enough (but not too warm), and massive enough, to have stable bodies of liquid water on its surface, life is, in theory, possible. Some scientists even believe that other liquids may support life, such as the liquid methane seas now known to exist in abundance on Saturn's moon Titan. I said life on other planets is possible "in theory" since how life actually originates is still the topic of heated debate where the realm of science meets the realm of theology. Who am I---who is anyone---to say that at this time with certainty, that in addition to stable liquid water, a "divine spark" is not also necessary for life to arise out of the lifeless raw elements of carbon, nitrogen, oxygen and hydrogen? Therefore, although life is in theory possible on other planets, and exoplanets (planets outside our own solar system) are known to exist which may very well support stable bodies of liquid water, we have no way of knowing at this time---and perhaps we never will---whether or not there is life on those planets. I suspect that there is, but that is only an opinion, and an unscientific one at that.

Answer 4

It isn't that life cant exist on another planet its that the life on other planets would be quite different from a human body form. They have already found life on mars. Not what we think of extra terrestrial but a micro size fish.

Answer 5

well we can't live on the other planet because it has no atmosphere.

Answer 6

It is impossible to live on other planets because of either extreme temperatures, unsuitable pressure, and toxic atmospheric composition.

Answer 7

because of the gravity of the earth sampak to the moon lapus to the sun and go back to the earth