You've know that the Kepler Space Telescope has discovered HUNDREDS of new planets outside our solar system -- but how does it find them? And how do scientists tell the real planets from the celestial fake-outs? It involves a lot of...

Researchers have discovered the most similar planet yet to Earth, 1,400 light-years away. Kepler-452b orbits its star in 385 days, just 20 days longer than our own year. Its star is just 4% larger, a billion and a half years older, and...

During its K2 campaign, NASA's Kepler spacecraft observed the eighth planet in our solar system, Neptune. Kepler detected small changes in Neptune's brightness caused by the planet's daily rotation, the movement of...

Just as our own sun has many planets, other stars also have planets of their own. These are called exoplanets. The first of these was discovered in the 1990s, and since then, thousands of others have been found, thanks largely to the...