For the first time, astronomers have detected an atmosphere around a rocky planet in the habitable zone of another star. This groundbreaking discovery, made by Collin Cherubim and Robin Wordsworth, marks a significant milestone in the search for extraterrestrial life. The planet, LHS 1140 b, is a 'super-Earth' located 50 light-years away, orbiting a red dwarf star. With a mass 5 times that of Earth and a radius 1.7 times that of Earth, LHS 1140 b is believed to have a rocky, Earth-like composition and a thin atmosphere, possibly containing water.
What makes this discovery even more remarkable is the planet's ability to retain its atmosphere despite the high levels of X-ray and UV radiation from its star. Cherubim's computer model predicted the existence of a helium atmosphere, which was later confirmed by the WINERED spectrograph at the Las Campanas Observatory. The helium atmosphere is escaping into space at a rate of hundreds of thousands of kilograms per second, heated to over 4,700 degrees Celsius by stellar radiation.
This finding raises intriguing questions about the planet's potential habitability. Could LHS 1140 b have oceans or other life-friendly features? The discovery also highlights the importance of ground-based telescopes in the search for alien atmospheres, challenging the notion that only space telescopes like the James Webb Space Telescope can make such discoveries.
As we continue to explore the cosmos, this breakthrough serves as a reminder of the vast possibilities that lie beyond our solar system. The search for extraterrestrial life is far from over, and with each new discovery, we inch closer to answering one of humanity's most profound questions: Are we alone in the universe?
