July 20, 2011
Two images, taken about a week apart by NASA's Hubble Space Telescope, show four moons orbiting the distant, icy dwarf planet Pluto. The green circle in both snapshots marks the newly discovered moon, temporarily dubbed P4, found by Hubble in June. REUTERS/NASA
Use the comment form below to begin a discussion about this content.
Sign in to comment
Or login with:
OpenID