• more about #internationalastronomicalunion
    Laurel Kornfeld: The need to keep the number of planets artificially low can be attributed to emotions and sentimentality as well. What is wrong with having a large nu... more »
    Terry: For crying out loud, Pluto's got three moons (that we know of) and has enough of a gravitational influence on the solar system that its existence was ... more »
    ♠ Final ♠: While you're waiting on New Horizons pick this up The Pluto Files in the mean time http://www.amazon.com/Pluto-Files-Neil-deGrasse-Tyson.../dp/039306... more »
    MonkeyT: Pluto, when someone asks you if you're a planet, YOU SAY YES! more »
    Timothy Klein: I really don't get this: either Pluto is not a planet, or there are 11 planets (with the reality being that there is probably more like 50, with most ... more »
    Matt Phillips: what about the 7 moons in the solar system which are larger than Pluto? (the Moon, Io, Europa, Ganymede, Callisto, Titan and Triton), i guess we shoul... more »
    Ruthless, If you let me: The New Horizons missions will confirm Pluto is not a planet, but actually a frozen Mass Relay. more »
    Grey_Area: Okay, one more time; if it has a Starbuck's, it's a planet. So, yes, Pluto is a planet. more »
    palmer45: Damn that Neil deGrasse Tyson! more »
  • #pluto

    Pluto May Get Let Back into the Planet Club

    For those still distraught about Pluto's demotion from full-fledged planet to dwarf, the battle is not over. The former planet has made some powerful allies who believe their discoveries will convince astronomers to bring Pluto back into the planetary fold. More »
  • #madgeophysics

    Are Mercury's Days as a Planet Numbered?