Nearby Star Came In with the Bang
伴隨宇宙大爆炸而來的恒星
There’s an old-timer in the neighborhood, and it’s got a story to tell. A new study of a relatively nearby old star shows that it’s almost as old as the big bang itself.
有個老朋友存在于地球附近,它還有一段故事 。據最新研究:近地有個我們發現已久的恒星幾乎與宇宙大爆炸相伴而生 。
The star HD 140283 lies about 190 light-years away in the constellation Libra. Astronomers have long known that it’s ancient, because it contains mostly hydrogen and helium—which were present at the dawn of the univers’—and few of the heavy elements that were forged later in stellar furnaces.
HD 140283恒星距離天秤座有190光年之遠 。天文學家先前就知道其是遠古恒星,因其主要由存在于宇宙誕生之始氫和氦元素組成,而這些大質量的元素較少出現在后期的恒星內 。
With the Hubble Space Telescope, researchers have now pinned down the distance to HD 140283, which allowed them to determine how bright the star is. Along with the chemical composition of the star, the newly derived stellar properties allowed for a new age estimate.
借助哈勃望遠鏡,研究者現在確認了HD 140283號恒星離地球的距離,這使他們能夠進一步測量該行星的亮度 。這個最新發現的星系資源還有待進一步做化學成分和年齡的最新估量 。
The study of HD 140283, in the Astrophysical Journal Letters [Howard E. Bond et al., HD 140283: A Star in the Solar Neighborhood That Formed Shortly after the Big Bang], found that the star is 14.46 billion years old. But the entire universe, as you may have heard, is only 13.77 billion years old. The two age estimates aren’t actually in conflict, because there’s always some uncertainty. The full age estimate is thus 14.46 billion years plus or minus 800 million years. Put your money on the minus.
對于HD 140283恒星的研究,據《天體物理學雜志》中Howard E. Bond 等人聯合發表的“HD 140283恒星:近地太陽系中緊隨宇宙大爆炸形成的恒星”一文中,闡明其存在了144.6億年之久 。 但整個宇宙的生成時間才僅僅有137.7億年 。這兩個對其年歲的推斷實際上并不沖突,因為有太多不確定因素 。因此,對該行星年齡的大致推斷應在144.6億萬年以上,也可能不超過80億年,后者可能性極大 。