A Mystery of Space: S T A R S- [Earth]

Earth is the most studied planet in the universe, because humans have the most access to it. Resulting from the studies of Earth, though, scientists can hypothesis what other planets might be like if they have some things in common with Earth (for example, silicate rock (which contains compounds of silicon and oxygen), is found on Jupiter's moon Europa, Mercury, Venus, Mars, and of course, Earth).
Earth is the only planet that scientists are sure contains living plant material, bacteria, and/or animals. They do think that there is a possibility that the sixth known moon from Jupiter, Europa, might contain some type of biological life. Scientists know that Europa contains frozen water, but it could also contain the largest ocean in our solar system.

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Earth Fact Sheet