Is Gliese 581 c a planet?

Artist’s impression of the five-Earth mass planet, Gliese 581 c, found in the habitable zone around the red dwarf Gliese 581, with the instrument HARPS on the ESO 3.6-m telescope. This set of travel posters envision a day when the creativity of scientists and engineers will allow us to do things we can only dream of now.

Why is Gliese 581c tidally locked?

Because Gliese 581c is so close to its star, a common belief is that the planet is tidally locked. This means that as it orbits, the planet always keeps the same side toward the sun. This phenomenon is common among moons of Jupiter and Saturn in our own solar system.

How long does it take Gliese 581d to orbit its host star?

The planet furthest out, Gliese 581d, orbits its host star in 66.8 days, while Gliese 581 e completes its orbit in 3.15 days.