New research suggests Pluto may have had a “kiss” with its largest moon billions of years ago in a harmless collision. The report, published in “Nature Geoscience,” describes how the minuscule dwarf ...

Planetary scientist Kelsi Singer was an undergraduate in 2006 when a spunky spacecraft launched with an ambitious goal: to fly by Pluto. It would take nearly a decade for the New Horizons probe to ...

Nearly four years after Pluto lost its official planet status, the confusion on how to treat the distant, downgraded neighbor remains in orbit. In classrooms that haven't ordered new textbooks since ...