Exomoons are extrasolar satellites, meaning they are orbiting other planets found far outside of our solar system. And these exomoons could offer an important clue about where alien life might be found. Scientists are becoming increasingly successful at finding exoplanets.

4,000 and counting have been found, with researchers reportedly shocked at how common they are.

However only a limited number of exoplanets are actually able to sustain alien life.

Many of the mysterious planets are either too proximate or distant from their sun.

This means any water, necessary for sustaining life, would either freeze or evaporate away.

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