Pluto's Moons Named

After a membership vote, the International Astronomical Union (IAU) has formally adopted the names Kerberos and Styx for the recently discovered fourth (P4) and fifth (P5) moons, respectively, of Pluto.

Fifth Moon of Pluto Found

Astronomers working with NASA's Hubble Space Telescope and its Wide Field Camera 3 have discovered a fifth moon orbiting the dwarf planet Pluto, temporarily designated "P5" and with an estimated diameter between 10 and 25 km.

Pluto's Fourth Moon Found

The Hubble Space Telescope has discovered a fourth moon in orbit around Pluto with an estimated diameter of less than 20 miles, and remains as-yet unnamed.

Pluto's Toxic Atmosphere

Long suspected but only recently proven with data from the James Clerk Maxwell Telescope, Pluto's atmosphere contains toxic carbon monoxide in an amount that has doubled since 2000, growing from a height of 62 miles above the surface to more than 1800 miles in what is suspected as an extreme seasonal change.

New Pluto Photos

New images from the Hubble Space Telescope reveal dynamic and rapid color changes in the atmosphere of Pluto, possibly indicating seasonal changes on the dwarf planet that has not yet undergone a full year since being discovered in 1930.