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Alien Planet May Be in Habitable Zone After All

The orbits of planets in the Gliese 581 system are compared to those of our own solar system. The Gliese 581 star has about 30 percent the mass of our sun, and the outermost planet is closer to its star than we are to the sun. Gliese 581d might be able to sustain liquid water on its surface.
(Image: © Zina Deretsky, National Science Foundation)

The alien planet

Gliese 581d, another

"The fact that

The Gliese 581

Gliese 581 is a red


But some researchers

The two planets on

Gliese 581d, on the

Modeling an alien

Gliese 581d is

Von Paris and his

The research team

The team's model

In the end, the

A medium- or

"I found it

Von Paris and his

Lots of caveats


Such work, while

"The problem,

Astronomers aren't

While von Paris is

"Gliese 581 is

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You can follow senior writer Mike Wall on Twitter: @michaeldwall.

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