Io in front of Jupiter; a color-composite made from images captured by Cassini on Jan. 1, 2001 as the spacecraft passed by on its way to Saturn. Io was 9.55 million km from Cassini, Jupiter was 9.9 million km away. Io is about 3,630 km across...about 155 km wider than our Moon. Shared by Jason Major.
Originally posted on Twitter.