NASA’s orbiting Kepler telescope has discovered an unlikely pair of planets orbiting a distant star. One is small and rocky, the other is large and gaseous. What makes them unusual is that both are ...

NASA scientists working on the Kepler Mission have discovered an unprecedented solar system, in which two planets with vastly different densities and compositions are locked in a surprisingly close ...

It is science fiction made fact: Astronomers have discovered two alien planets around the same star whose orbits come so close together that each rises in the night sky of its sister world like an ...

Two planets with very different densities and compositions are locked in surprisingly close orbits around their host star, according to astronomers working with NASA’s Kepler mission. One planet is a ...

The two planets circling Kepler-36, a sun-like star in its senior years, are as different as Earth and Neptune. But unlike the hundreds of millions of miles that separate our solar system's rocky ...

(CNN) — The discovery of a planetary “odd couple” is broadening the way scientists think about planetary migration. Scientists at the Harvard Smithsonian Center for Astrophysics and University of ...

Few nighttime sights offer more drama than the full Moon rising over the horizon. Now imagine that instead of the Moon, a gas giant planet spanning three times more sky loomed over the molten ...

In this artist's conception, a "hot Neptune" known as Kepler-36c looms in the sky of its neighbor, the rocky world Kepler-36b. The two planets have repeated close encounters, experiencing a ...