But what about this? Does it have a moon to protect it from asteroids and to churn this seas? We have a remarkable planet here in our girl Earth. No need to go elsewhere.
According to one of the sources (either in the related threads or another new source—have looked at a fair amount so far), the planet would be subjected to tidal forces from its primary (its star). Earth also is subjected to tidal forces from the Sun, but the tidal forces from the Moon have more effect as the Moon is closer to Earth than the Sun. In contrast, Gliese 581 c is much closer to its sun than Earth is to the Sun.
I have read some interesting papers about how we will eventually need to go elsewhere unless we want to die out here. But that time is far in the future.
Ours is a spiffy little planet, but it is just the cradle for our species and we cannot stay in the cradle forever. Also, it is a damn tiny planet and humanity could use some extra elbow room. We can start with colonisation of nearby bodies and, when technology allows, head out of our solar system.