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Astronomers Confirm First Atmosphere on Habitable-Zone Planet

scienceJul 19, 2026·363 words·3 min read

Astronomers have confirmed an atmosphere around a rocky planet orbiting inside the habitable zone of another star, the first time such a detection has been verified by observation. The planet, LHS 1140b, circles a small red dwarf in the constellation of Cetus; the BBC places it 48 light years from Earth, while the Guardian reports 49. Writing in the journal Science, a team led by Dr Collin Cherubim, until recently based at Harvard University, described helium streaming away from the planet into space.

A planet needs the right distance from its star to have liquid water. If it is too close, it is too hot. If it is too far, it is too cold. Scientists know more than 6,000 planets around other stars. Hundreds are at the right distance, but only a few dozen are small and rocky like Earth. None showed air before this discovery. LHS 1140b was found in 2017. It is heavier and wider than Earth.

The helium did not show up again in 2025. The team checked their work carefully. One scientist in England called the finding an important step. But another scientist in the Netherlands was more careful. She said the gas comes from very high above the planet, not from the surface. Helium cannot support life by itself. Other gases may be deeper down.

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