The exploration of Pluto wasn’t easy, but it sure was worth it. As David Grinspoon and I recount in our book, Chasing New Horizons, it took 14 years (1989 to 2003), about a dozen different mission ...

Though technically not a planet, it has as rich geology as any of its planetary siblings in the solar system Shi En Kim - Reporter A color-enhanced photo of Pluto that was captured by the New Horizons ...

"My very energetic mother courteously just served us nine pickled cucumbers, xylophone." Schoolchildren used to learn a mnemonic for nine planets. The mother was less courteous, and there were pies ...