Astronomers have confirmed the discovery of the nearest rocky planet outside of our solar system.The planet orbits a star in another solar system about 21-light years away. It cannot be seen from Earth with the naked eye. The planet is bigger than Earth, but it's too close to its star to sustain life.
The newfound world doesn't have a very good name yet -- it's just called HD 219134b. The planet was first detected using the Galileo National
Telescope in the Canary Islands. NASA's Spitzer Space Telescope confirmed the finding.
Because scientists say it will be easy to study right here from Earth. The planet sits at just the right angle to detect it when it passes in front of its sun and that will let scientists
learn a lot about the planet's size and composition.
These types of planets are "worth their weight in gold," Michael Werner, the project scientist for the Spitzer mission at NASA's Jet Propulsion Laboratory in Pasadena, California, said in a news release.
Because the planet orbits a different star, it's in a different solar system. It's called an exoplanet. NASA had confirmed 1,879 exoplanets as of July 23, 2015. Many have been spotted by another space probe -- the Kepler spacecraft which was launched in 2009.
Recently Kepler made big headlines when it spotted a planet that NASA described as Earth's cousin.
But that planet is 1,400 light-years away. Planet HD 219134b is much closer to Earth -- only 21 light-years away.
"Most of the known planets are hundreds of light-years away. This one is practically a next-door neighbor," said Lars A. Buchhave, an astronomer at the Harvard-Smithsonian Center for Astrophysics in Cambridge, Massachusetts. Buchhave is co-author of a study about the new planet.