18 New Planets Discovered

18 New Planets Discovered

ILUSTRASI

 The total of 18 alien planet was recently re-discovered.These planets have roughly the same size with the size of the planet Jupiter. They surround a star larger than the size of our sun.This discovery increases the number of known planets orbiting stars in big sizes. On the other hand also help astronomers better understand how the giant planets are formed and grow in our solar system.A few months ago, researchers found 50 planets of the solar system new foreign, including a new planet that may hold life.Now there are at least 700 alien planets have been discovered.This amount, according to experts, will continue to grow.Space.Com reported that all 18 new planets were discovered in research at the Keck Observatory, Hawaii. 
The researchers observed a number of A-type stars that have been "retired" which has 1.5 times the size of the sun.The 18 newly discovered alien planet is circulating is relatively far from the stars that they surround. The distance is about 0.7 times the distance between earth and sun, or about 150 million kilometers.This discovery also led to one of proving the theory of planet formation and evolution of the so-called "core accretion".According to this theory, planets grow from a collection of gas and particles gathered in the protoplanetary. This theory also predicts characteristics of planetary systems are formed, for example, the number and size of planets, depending on how strong the mass of the star.Another theory, "gravitational collapse", argues the planets formed when a large cloud of gas and dust suddenly agglomerate into planets.

"It was nice to see all the evidence points to one mechanism of formation (planets)," said John Johnson of Caltech in Pasadena.Research conducted by Johnson and colleagues was published in the Astrophysical Journal Supplement Series this December issue.