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BOSTON – Astronomers have discovered a type rocky planet beyond the solar system that weighs 17 times as much as Earth while being just over twice the size, scientists said.

The so-called “mega-Earth” circles a very old star called Kepler-10, which is located about 560 light-years away from Earth the constellation Draco.

Physicist Dimitar Sasselov, the Director the Harvard Origins Initiative, said the discovery, announced at the American Astronomical Boston, .S., a surprise since big planets were believed be mostly gas, not solid rocky bodies like Earth or Mars.

Sasselov told reporters at a news conference Boston, .S. that the scientists do not yet understand how the planet, known as Kepler-10c, formed, a diameter about 18,000 miles (29,000 km), 2.3 times greater Earth’s.

“A mega-Earth is a lot of solids concentrated in the same place without any gas. That is a problem because our understanding of how planets form requires the solids get together in an where almost 99 per cent of the mass is hydrogen and helium,’’ he added.

He explained that smaller solid bodies like Earth or Mars, believed form from leftover materials, less time to pull themselves together, longer incubation time.

He added that large planets should gather up massive amounts of gas in the – or so scientists thought.

“However the mega-Earths are formed, the discovery of another type of rocky world augurs well in the search for beyond Earth,’’ Sasselov added.

He stressed that “as far as we know – and we know very little about origins of – we think the emergence of from geochemistry occurs solid planets.’’

Related research shows that about 75 per cent of the planets found NASA’s Kepler space telescope are less four times Earth’s diameter.

In the solar system, there is nothing between the size of Earth, the largest rocky planet, and Neptune, the smallest gas giant with a diameter nearly four times Earth’s.

“We really want to know about these planets,” astronomer Lars Buchhave, with the Harvard-Smithsonian Centre for Astrophysics, told reporters. (Reuters/NAN)