"We found that hundreds of exoplanets are larger than they appear, and that shifts our understanding of exoplanets on a large ...

During all of this motion and commotion, the dust grains slam into each other, forming pebbles which then grow into larger and larger boulders until they form planets. As the planet grows in size ...

The same team also discovered two new planets orbiting a second star. These planets are much larger, about twice the size of Earth, and they take six and 20 days to orbit their sun respectively.

This story was updated at 1:55 p.m. EST. The Milky Way hosts at least 17 billion Earth-size alien planets, and probably many more, a new study reveals. Astronomers have determined that about 17 ...

Two Earth-size planets have been discovered in a star system 950 light-years away, but unfortunately they don't quite have what it takes to host life. Scientists on the discovery team explain why not.

The team grouped planets into five different sizes and 17 percent of them, roughly 1 in 6, have a planet 0.8-1.25 times the size of Earth in an orbit of 85 days or less.

Astronomers Find 7 Earth-Size Planets Around A Nearby Star : The Two-Way Some of the planets could be home to liquid water, but it remains unclear whether life could exist on such strange worlds.

1. The planet is 1.1 times the size of Earth. Past discoveries have been 1.4 times the size of Earth or larger, Quintana said. 2. Kepler-186f has a shorter orbital pattern: 130 days to circle its ...

The planetary system harboring Kepler-138 b, the first exoplanet smaller than Earth with both it mass and size measured. All three planets known to orbit the star have been characterized by NASA ...

In fact, when we look at the data from planet-hunting missions such as the Kepler mission or from the Transiting Exoplanet System Satellite, there is a gap in the planet sizes.Namely, there aren't ...