Earth's next door neighbour 21 light yrs away...

The latest discovery comes just over a week after the first Kepler-452b exoplanet was found.

Earth's next door neighbour 21 light yrs away...

World Bulletin / News Desk

NASA astronomers have found another exoplanet outside the solar system. It’s larger than Earth and is 21 light-years from our planet.

The new planet has been nick names HD 219134b, and can’t be seen directly even with telescopes, but the star the planet orbits is visible to the human eye in the Cassiopeia constellation, near the North Star, said NASA in a report in RT.

The telescope does sees the dimming of the star, and can calculate the planet’s size and other parameters based on it. The planet itself weighs 4.5 times more than Earth, and has a fast three-day orbit around its star.

HD 219134b is also the closest example of a transiting planet which is a planet that crosses in front of its star and can be studied.

"Transiting exoplanets are worth their weight in gold because they can be extensively characterized. This exoplanet will be one of the most studied for decades to come," said Michael Werner, the project scientist for the Spitzer mission at NASA's Jet Propulsion Laboratory in Pasadena, California.

Transiting is rare because of the different planets’ orientation to Earth. The process consists of the planet’s orbit situated between its star and Earth, dimming the star’s light as a result.

An upside of HD 219134b is that it is relatively close to Earth, scientists say.

"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 and study co-author at the Harvard-Smithsonian Center for Astrophysics in Cambridge, Massachusetts. 

The nearest planet that astronomers know about is GJ674b at 14.8 light-years away. However, there are no details about its composition.

Last Mod: 31 Temmuz 2015, 11:47
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