I’m not sure I can agree that space forms “the basis for most of our mythology and dreams”–whether we’re talking Greek titans or druidic spirits, a lot of mythology is based on worldy phenomenons–but even supposing it did, Earth certainly forms the basis for human existence and all known life itself.

Earth is the epicenter of all known thought. And if there is anything out there in space with the ability to dream like we do, it is likely far beyond our reach in terms of distance and time.

This isn’t to say that we shouldn’t care about space, only to say that we should care a whole lot more about what exists here on Earth.