半人马座阿尔法星：最近的恒星系统
(原标题: Alpha Centauri: The Closest Star System)
2025-01-01
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离太阳最近的恒星系统是半人马座阿尔法星系。在这个系统的三颗恒星中，最暗的一颗——被称为比邻星——实际上是离我们最近的恒星。明亮的半人马座阿尔法星A和B形成了一个紧密的双星，它们之间的距离只有地球-太阳距离的23倍，略大于天王星和太阳之间的距离。在北半球的大部分地区都看不到阿尔法星系。半人马座α A，也被称为半人马座七星，是半人马座中最亮的恒星，也是夜空中第四亮的恒星。天狼星是最亮的，尽管它的距离是天狼星的两倍多。令人兴奋的巧合是，半人马座阿尔法星A与我们的太阳是同一类型的恒星，而比邻星现在已知有一颗可能适合居住的系外行星。
查看原文解释
The closest star system to the Sun is the Alpha Centauri system. Of the three stars in the system, the dimmest -- called Proxima Centauri -- is actually the nearest star. The bright stars Alpha Centauri A and B form a close binary as they are separated by only 23 times the Earth- Sun distance - slightly greater than the distance between Uranus and the Sun. The Alphasystem is not visible in much of the northern hemisphere. Alpha Centauri A, also known as Rigil Kentaurus, is the brightest star in the constellation of Centaurus and is the fourth brightest star in the night sky. Sirius is the brightest even though it is more than twice as far away. By an exciting coincidence, Alpha Centauri A is the same type of star as our Sun, and Proxima Centauri is now known to have a potentially habitable exoplanet.
© Telescope Live, Heaven's Mirror Observatory; Processing: Chris Cantrell