Theoretically, there is room for thousands. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. The solar system contains eight planets: Mercury, ...

For life to develop on a planet, certain chemical elements are needed in sufficient quantities. Phosphorus and nitrogen are essential. Phosphorus is vital for the formation of DNA and RNA, which store ...

The Kepler telescope has looked up in perfect silence at the stars and found more than 1,200 new worlds. NASA said Tuesday that Kepler, constantly searching the cosmos for "exoplanets" circling other ...