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.