Astronomers have discovered a mirror-like exoplanet LTT9779b

The European space telescope "Heops" has discovered exoplanet LTT9779b, which reflects almost all of the light from its star like a mirror. It is the first such object outside the Solar System visible in our night sky.

LTT9779b, the size of Neptune, is located 260 light-years away from Earth. It reflects 80% of the light from its host star and completes a revolution around it in 19 hours.

One side of the exoplanet heats up to 2000 °C, which is too high for the formation of ordinary clouds. However, on LTT9779b, they form similar to condensation in a bathroom with a hot shower on. The heated streams turn into metallic clouds, providing protection to the planet's atmosphere from the star's heat.