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The Most Amazing Alien Planet Discoveries of 2013

Mike Wall
Published: December 29, 2013

Three Possibly Habitable Planets Circling the Same Star

European Southern Observatory

This artist's rendering shows the three

Astronomers notched another first in 2013 — the first extrasolar system to harbor three planets in its habitable zone, that just-right range of distances where liquid water could exist on a world's surface.

Researchers had already confirmed three planets around the star Gliese 667C before this year. But in June, scientists announced that the star hosts at least six, and possibly seven, worlds, and that three of them may be capable of supporting life as we know it. The three potentially habitable planets are all "super-Earths," worlds just slightly larger than our own.

Copyright 2013 SPACE.com, a TechMediaNetwork company. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

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