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Comparing the Gliese 581 to Our Solar System
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% the mass of our sun, and the outermost planet is closer to its star than we are to the sun. The fourth planet, G, is a planet that could sustain life.
Image Credit: National Science Foundation/Zina Deretsky