What planet has sulphuric acid rain? How did astronomers determine this?

1 Answer

Planet Venus have thick cloud of atmospheric gases.

Explanation:

Carbon di oxide, nitrogen and sulfur di oxide are in the clouds. Sufur dioxide make acid and it rains as sulfuric acid.enter image source here picture credit david darling .information.
Several probes in the Venera series by Russia landed on surface e of Venus and measured the gases.