2 publishers · first seen Tue, 27 Oct 2026 10:20 UTC · updated Tue, 27 Oct 2026 16:02 UTC
Researchers using the James Webb Space Telescope (JWST) have observed the exoplanet TOI-561 b, which orbits its star in just 10.5 hours. The planet, which is likely covered in molten rock, appears to have a reflective atmosphere that helps it reflect about 75% of the starlight it receives. This atmosphere may consist of silicate clouds, including silicon dioxide and magnesium silicate, which could act as a natural sunscreen. The findings challenge current theories about the survival of atmospheres on such extreme planets. The researchers hope to determine the exact composition of the atmosphere with further observations using JWST.
The discovery of an atmosphere on TOI-561 b is surprising because it orbits so close to its star that it should have lost its atmosphere long ago. The atmosphere may be replenished by gases escaping from the planet's molten interior, which could explain how it has maintained an atmosphere for billions of years.
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