Metallic clouds turn hot exoplanets into the largest mirror in the universe

Astronomers have discovered the most reflective planet ever outside the solar system. An extremely hot exoplanet, or exoplanet, acts as a cosmic mirror because it is covered in reflective clouds of metal.

The planet, called LTT9779 b, is located about 264 light-years from Earth and reflects about 80% of the light that shines on it from its parent star. Compared to LTT9779 b, Earth reflects only 30% of the light that falls on it from the Sun. LTT9779 b is so hot and reflective that it’s the first exoplanet found to give the solar system’s brightest planet, Venus, a run for its money; Venus has a thick layer of clouds that reflect about 75% of the incident sunlight.

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