(NewsNation) — 据发表在《自然·天文学》上的新研究，天文学家发现了围绕白矮星的第二代行星的证据。
(NewsNation) — Astronomers have discovered evidence of a second-generation planet found around a white dwarf, according to a new study published in Nature Astronomy.
研究人员聚焦于白矮星HS 0209+0832，这是一颗低质量恒星在耗尽核燃料后留下的核心残骸。
Researchers focused on white dwarf star HS 0209+0832, the core remnant of a low-mass star that burned through its nuclear fuel.
他们发现了化学特征，表明存在一颗第二代行星——一种由死星抛射残骸形成的世界。
They discovered chemical signatures indicating the existence of a second-generation planet, a world formed from the cast-off remnants of the dead star.
已知的大多数行星，包括我们太阳系中的行星，都是第一代行星，它们是在恒星诞生时剩余物质中形成的。
Most known planets, including those in our solar system, are first-generation planets, which form from material left over when a star is born.
该团队使用了美国宇航局哈勃望远镜的数据，该数据包含了该望远镜于1999年首次观测该恒星时大约100个无法识别的化学特征。
The team used data from NASA's Hubble Telescope, which contained roughly 100 chemical features from its first observation of the star in 1999 that could not be identified.
他们将这些化学特征鉴定为可能来自恒星在垂死过程中抛射的物质，并指出他们发现的元素只能在垂死恒星的条件下形成。天文学家推测，这些物质凝聚形成了一颗巨型气态行星。
They identified the chemicals as likely to have come from the material ejected by the star as it died, noting that the elements they discovered could only be formed under the conditions of a dying star. The astronomers theorize that the materials coalesced into a giant gas planet.
该行星被估计为一颗气态巨行星，大小约与木星相当，尽管它正在快速失去大气层。天文学家仍然认为，随着白矮星的冷却，该行星很可能得以存续。
The planet is estimated to be a gas giant about the same size as Jupiter, though it's rapidly losing atmosphere. The astronomers still believe it is likely to survive as the white dwarf cools.
一旦白矮星保持恒定温度，美国宇航局报告称，该行星可能在适居带内保持稳定数百万年。
Once the white dwarf maintains a consistent temperature, NASA reported that the planet could remain in a stable habitable zone for millions of years