I'm not in love with the design, but it's alright.
As for the other ones, I don't see why the flag needs to have anything like a map of the earth or of the solar system. It's a flag. Most flags just use symbolism that represents the history of the country, its values, the people that live there, a stylized representation of some aspect of the countries geography, etc.
Unless we're really afraid that the aliens won't find us.
I think we are not afraid, but we just prepare.
It's kind of scary come to think of it. I mean, it's like those futuristic movies that depict the future with space ships and flying cars... Maybe we need this flag when we destroy our home (EARTH) and go on in search of other planets to inhabit, you now, like conquistadors did, or American astronauts, it kind of creeps me out
I'm not sure about your opinion. Why you need a flag when you destroy something. I mean, world countries made the flag to became their identity. So imo the flag is identity now for our planet, Earth.