Explore
the cosmos

Eight planets, four galaxies and the distances between them — a short tour from our Sun to 31 million light-years away.

Start with the planets Jump to galaxies

Our solar system

The eight planets in order from the Sun. Select one to see its numbers.

Planet sizes are relative to each other on a square-root scale, so Mercury stays visible next to Jupiter. Spacing is not to scale.

Our own galaxy and three neighbours you can find in the night sky with a telescope — or, for Andromeda, your eyes.

Questions about the site, a fact we got wrong, or an object you want added — send us a note.