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Planet o wielkości ziemia odkryta w systemie Alpha Centauri
Temat: Nauka i technologia
Do some Exercises: Słuchaj i zapisuj Tworzenie zdań Ukryte słowa
Astronomers in Europe have discovered the first-ever planet with a mass similar to Earth and orbiting a star like the Sun. And, in galactic terms, it's right next door.
The unnamed planet is in the Alpha Centauri star system, the nearest system to Earth, according to the European Southern Observatory (ESO).
"This result represents a major step towards the detection of a twin Earth in the immediate vicinity of the Sun. We live in exciting times!" said Xavier Dumusque of the Geneva Observatory and Centro de Astrofisica da Universidade do Porto in Portugal in a press release on the discovery.
Despite the excitement, scientists say the new planet's climate likely would not be nearly as hospitable as Earth.
"Its orbit is very close to its star and it must be much too hot for life as we know it," said Stéphane Udry of the Geneva Observatory and a co-author of the paper about the discovery.
The newly discovered planet orbits a mere six million kilometers from its star, much closer than Mercury is to the Sun.
Alpha Centauri is the nearest stellar system to the earth's solar system at only 4.3 light-years, making it one of the brightest objects in the southern skies. It is actually a three-star system made up of two stars similar to the Sun orbiting close to each other, Alpha Centauri A and B, and a more distant and faint red star known as Proxima Centauri.
By detecting tiny wobbles in the motion of Alpha Centauri B, astronomers were able to determine the presence of the planet. The planet's effect on the star causes it to move no more than 51 centimeters per second, or about the speed of a baby crawling, according to a press release.
Source: voanews.com
