One Pluto year equals 248 Earth years. At 1473 miles in diameter—about half the width of the United States—Pluto is the ...

Pluto's orbit: Quick facts Pluto's rotation is retrograde compared to the solar systems' other worlds; it spins backward, from east to west. Average distance from the sun: 3,670,050,000 miles ...

A new dwarf planet, discovered beyond Neptune and described as Pluto's 'cousin,' could void the hypothesis of a Planet X in ...

Pluto is a dwarf planet; humans declared it to be one in 2006 since it is so small. It has little “ice mountains” on the surface. Scientists think the inside is actually water. Pluto’s ...

Jess Thomson is a Newsweek Science Reporter based in London UK. Her focus is reporting on science, technology and healthcare. She has covered weird animal behavior, space news and the impacts of ...