How do you find air around a planet that is forty-eight light-years away? You do not take a photograph of the air. You watch what the planet does to starlight. In July twenty twenty-six, researchers reported strong evidence that a rocky world called L H S one one four zero b has an atmosphere. It orbits a small red dwarf in a temperate region that astronomers call the habitable zone. That phrase means the planet receives a level of energy where liquid water could exist under the right conditions. It does not mean that water or life has been found. The planet is about five point six times Earth's mass, about one point seven times Earth's radius, and it goes around its star once every twenty-four point seven days. Those numbers make it an interesting place to test a difficult question: can a rocky planet keep an atmosphere for billions of years?
本期内容
一颗距地球约 48 光年的岩石行星 LHS 1140 b，出现了大气存在的强证据。研究人员通过光谱观测捕捉到正在逃逸的氦；这被报道为太阳系外宜居带岩石行星首次出现的大气证据。1
本期英文会解释三件事：光谱如何留下大气线索，为什么二零二四年和二零二五年的观测结果不同，以及「宜居带」为什么不等于「已经发现生命」。LHS 1140 b 的质量约为地球的 5.6 倍，半径约为地球的 1.7 倍，公转周期约 24.7 天；这些参数和氦逃逸信号共同构成了研究人员的判断背景。2
听法提示
第一遍只问自己三个问题：研究人员测量了什么？氦为什么能成为大气线索？这项发现还没有证明什么？中文提示部分会带你抓住
spectroscopy、spectrograph、helium、upper atmosphere 和 retain。第二遍重点听条件、因果和限制：
if、because、does not mean。科学新闻里，知道一个结论的边界，和听懂结论本身一样重要。References
- 1Harvard scientists detect atmosphere on distant Earth-like planet
current.fas.harvard.edu
- 2Detected: Rocky, habitable-zone exoplanet with an atmosphere
carnegiescience.edu
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