Temperature of a rocky exoplanet measured

Webb Telescope confirms nearby rocky planet has no atmosphere

James Webb Space Telescope finds no atmosphere on Earth-like TRAPPIST-1 exoplanet

[NASAWebb] TRAPPIST-1 b: We give it a one (M-dwarf) star review; it lacks atmosphere. Webb found the dayside temperature of this rocky exoplanet to be about 450º F (227º C) — suggesting it has no significant atmosphere