The star symbolizes the 5 continents, humanity in space (Africa, America, Asia, Europe and Oceania). The black color is the space, the last frontier, the final objective where the star (humanity) is.
The blue line in the middle is the terrestrial atmosphere, the 100km that must be crossed to be in outer space, and the clearest blue is Earth, our place and home planet, a planet of water and from which we all come.
This flag symbolizes where we come from and where we are going, the union of humanity in a common goal.