# Atmospheric discovery on exoplanet TOI-561 b

> Developing situation record from CLSTR: https://clstr.news/situations/atmospheric-discovery-on-exoplanet-toi-561-b
> Updated: 2026-10-30T11:34:00.000Z. Sources: 10. Developments: 2.

Astronomers using the James Webb Space Telescope have identified evidence of an unexpected, reflective atmosphere on the lava exoplanet TOI-561 b. Located approximately 280 light-years from Earth, the rocky super-Earth orbits its host star extremely closely, completing a revolution in less than 11 hours.

Researchers suggest the planet possesses a thick layer of silicate mineral clouds, such as magnesium silicate and silicon dioxide. This layer acts as a natural “sunscreen,” reflecting approximately 75% of the stellar light received and preventing the planet from reaching extreme temperatures. This discovery challenges existing planetary theories, as the intense radiation from the host star would typically be expected to strip such an atmosphere away. Scientists are investigating whether the atmosphere is maintained through volcanic outgassing from the molten surface or if the planet began with an unusually large supply of gases.

## Timeline

### 2026-10-30: Astronomers discover unexpected atmosphere on lava planet TOI-561 b

Astronomers discovered a reflective cloud layer on the rocky, lava-covered exoplanet TOI-561 b, which protects it from extreme stellar heat.

4 sources. https://clstr.news/cluster/astronomers-discover-unexpected-atmosphere-on-lava-planet-toi-561-b

### 2026-10-27: Exoplanet TOI-561 b may possess a reflective, mineral-rich atmosphere

Data from the James Webb Space Telescope suggests the lava exoplanet TOI-561 b has a reflective atmosphere of silicate clouds that protects it from intense stellar radiation.

6 sources. https://clstr.news/cluster/exoplanet-toi-561-b-may-possess-a-reflective-mineral-rich-atmosphere

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Cite as: Atmospheric discovery on exoplanet TOI-561 b. CLSTR, https://clstr.news/situations/atmospheric-discovery-on-exoplanet-toi-561-b