The Colors of Distant Icy Worlds
At the outskirts of the Solar System, beyond Neptune's orbit, millions of icy chunks circle the Sun — leftover building material from the era of planet formation. Astronomers call them trans-Neptunian objects, and they have a peculiarity: their surfaces are painted in various shades of red. Some are merely reddish, like rust, while others are very red, like dried blood.
