This image, taken by the NASA/ESA Hubble Space Telescope, shows five moons orbiting the distant, icy dwarf planet Pluto. The green circle marks the newly discovered moon, designated S/2012 (134340) 1, ...

Pluto, formal designation 134340 Pluto, is the second-most-massive known dwarf planet in the Solar System (after Eris) and the tenth-most-massive body observed directly orbiting the Sun. Originally ...

Astronomers stripped Pluto of its full-fledged planet status in 2006, but the celestial body still has its moments, not to mention its fans. More of those moments are coming soon when Flagstaff ...

Following the Aug. 24 resolution by the IAU to the effect that the solar system contains eight “planets” (Mercury- Neptune), with (1) Ceres, Pluto (cf. IAUC 255), and 2003 UB313 (cf. IAUC 8577) to be ...

Pluto. The mere mention of this dwarf planet will reveal a tried and true Flagstaffian with immediacy. They'll lament the year 2006, when it was demoted from planet to dwarf planet, laud its ...

Pluto's new-found moon, visible as a speck of light in Hubble images, is estimated to be irregular in shape and between 10 and 25 kilometres across. It is in a 95 000 kilometre-diameter circular orbit ...

The discussion does not stray as far as to imagine what some future astronaut might find, but it does weigh-up the conditions that a future space probe might experience should NASA send a spacecraft ...

Astronomers have just announced that tiny Pluto has a fifth moon! It was discovered using the Hubble Space Telescope: You can see it in that image (click to enhadesenate) in the green circle. Pluto ...

An ocean of liquid water deep beneath the icy surface of Pluto is coming into focus thanks to new calculations by Alex Nguyen, a graduate student in Earth, environmental and planetary sciences in Arts ...