Vogt's group of astronomers said that they have found two more planets orbiting Gliese 581, named 581f and 581g. They published their findings in 2010. For planet 581f, they found a mass of 7.0 Earth masses and an orbit length of 433 days. For the other new planet, 581g, the group measured a mass that was 3.1 times the mass of the Earth and an orbit that was 36.6 days long.
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