The International Flag of Planet Earth

Finally, a signpost to plant when we conquer alien worlds.

Realizing that no self-respecting galactic colonization force can conquer other planets without a proper flag, Oskar Pernefeldt created the International Flag of Planet Earth and showed off how it might look on a spacesuit and planted on extra-terrestrial soil.

The color scheme worked well for the United Federation of Planets in Star Trek, so Pernefeldt is clearly on the right path.