Is Earth the only known planet with life on it?

Answer 1

Earth has one natural satellite known as "the Moon" and many humanmade ones (swuch as Sputnik).
Yes. It has one. Its formal name is "Luna", but most people refer to it as "the moon".

If there were none, then the phrase "the moon" would have little meaning, whereas if there were

more than one, then the phrase "the moon" really wouldn't narrow it down too well.

Does your planet have any ?

Answer 2

As regards oceans of surface water, the simple answer is "yes", as far as we know. However, the Universe is such a large, complex place that if you can imagine it, it may be happening somewhere. Unfortunately, the newly discovered Gliese 581e exoplanet is not a candidate for a "waterworld" due to its location outside the 'habitable zone' where planets are rocky and should be able to sustain liquid water. However, astronomers predict that Gliese 581d may have surface water.

"Europa", which is a moon of Jupiter, is a frozen world. However, planetary geologists believe that under the ice are deep oceans, possibly even containing life.

Also, water isn't the only type of ocean possible. For example Saturn's moon Titan has lakes made out of methane. There are also known to be huge amounts of frozen water ice, a little like a hidden ocean, beneath the surface of Mars. Water is found all over our solar system on planets, moons and comets.

Think to yourself, where did our oceans come from? The answer is "space". If it happened here it should have happened in other places in the Universe. And that is what is so exciting. Where there is water there may be life.

Answer 3

Currently, it's the only planet that is known to have life on it for sure. That doesn't mean, however, that it's the only planet that has ever had life. There are planets that are known to possibly support life, and many that are suspected to have had life before. It's worth nothing that life isn't restricted to just planets. It's not impossible for other objects like moons to support life, even on a microbe level.

Answer 4

The Earth has many satellites only one of which is natural, the moon. It is much larger than any of the artificial satellites . Many people have searched for other natural satellites around the Earth but have discovered none so far.

Answer 5

No. Most planets in the Solar system have moons. Mercury and Venus are the only planets that do not.

Answer 6

No, because the Moon is not a planet. Venus is known as "Earth's Sister Planet."