Although we know a lot about the planets in our solar system, we have much more to learn. Scientists want to know more about the composition of the planets and their atmospheres. Some people wonder whether life ever existed on these lonely outposts.

Martian


  • For centuries people have wondered whether there is other life in our solar system. You may be surprised to learn that some scientists believe there may be.
    Where did scientists discover bacteria-like organisms that suggest that there was once life on Mars?
    a meteorite
    the surface of Mars
    a comet
    Press the button to see how well you did.

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