Scientists using a telescope in Hawaii have discovered a never-before-seen dwarf planet lurking within the ring of icy bodies beyond the orbit of Neptune. The small new world -- temporarily named ...

In August 2006 the International Astronomical Union General Assembly adopted a resolution to reclassify Pluto as a dwarf planet. The reasoning was that it didn't satisfy one of three newly defined ...

A blue atmosphere, smooth areas, and youthful mountain ranges - this dwarf planet is full of surprises. When NASA's New Horizons probe flew past Pluto in July 2015, the images it returned astonished ...