Meet Kepler-47d, a puffy planet that lies 3,340 light-years from Earth. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. The only known ...

Campbell Elementary third grade students hold up drawings of each of the planets as they sing "The Planet Song," under the direction of Janelle Nicolaus, during the school's "Planet and Space Songs" ...

Third graders at Spokane's Balboa Elementary School ranked the planets as an Earth Day salute. Here is a sampling of their work. "I think that Pluto should be first because it is a dwarf planet and it ...

The candidate planet Proxima d is estimated to be just 25% as massive as Earth. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. The sun's nearest ...