So far, none have looked quite like Earth.

In fact, it could don a daring shade of purple.

A red sun could give them the most favorable conditions for photosynthesis.

NASA has confirmed more than 5,000 exoplanets to date.

NASA has confirmed more than 5,000 exoplanets to date.Illustration: NASA

We are just opening our eyes to these fascinating worlds around us, Kaltenegger said.

News from the future, delivered to your present.

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