人类的两个研究发现之一就是对天外星系的观测和研究,而如果能够发现新的行星则对扩展人类的视野会产生巨大的推动作用。近日科学家们又发现了一颗新的行星。这究竟是怎么回事呢?
If threes a crowd, a new planet recently discovered orbiting a sunlike star is really cluttering up its neighborhood.
The new planet is the fourth Jupiter-like world to be found around the young star HR 8799, astronomers announced today. The same team had previously found the other three planets in 2008, when they took a direct picture of the star system.
Of the more than 500 planets discovered to date outside our solar system, most have been found via indirect methods, such as looking for planets gravitational tugs on their host stars or for dips in starlight when planets pass in front of their hosts.
The new planet was also found in a direct image of the HR 8799 system. But based on the masses of the planets and their distances from the star, the fourth world challenges current theories of planet formation, according to the study authors.
This is the first multiplanet system directly imaged so far, so its quite a feat, said lead study author Christian Marois, an astronomer at the Herzberg Institute of Astrophysics in Canada.
But we are now stuck with four planets we cannot explain their formation and their current locations by any of our models.
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