The presence of sulfuric acid

The earth
Acid rain contains sulfuric acid, and sulfur dioxide (SO2) in acid rain reacts with atmospheric water to produce sulfite (H2SO3), which is oxidized by atmospheric oxygen to produce sulfuric acid, which falls to the ground with rain, causing the formation of acidic soil. Improved acidic soils are usually neutralized with alkaline substances. In nature, many sulfur-containing minerals, such as ferrous sulfide, form sulfuric acid after oxidation reactions, and the liquid formed is highly acidic, which can oxidize residual metals and release toxic gases. In the biological world, a species of sea slug (Notaspidean pleurobranchs) can also spray secretions containing sulfuric acid to defend itself against enemies.
Golden Star
Sulfuric acid can be found in the upper atmosphere of Venus. This is mainly due to the sun's photochemical action on sulfur dioxide, carbon dioxide and water. Ultraviolet photons with wavelengths shorter than 160nm can photolysis carbon dioxide, changing it into carbon monoxide and atomic oxygen. Atomic oxygen is very active, and it reacts with sulfur dioxide to become sulfur trioxide. Sulfur trioxide further reacts with water to release sulfuric acid. Sulfuric acid is liquid in the higher, cooler regions of Venus's atmosphere, and this thick layer of sulfuric acid clouds about 45 to 70 kilometers from the planet's surface covers the entire surface of the planet. This layer of the atmosphere is constantly releasing acid rain.
On Venus, sulfuric acid is formed in a constant cycle. As sulfuric acid evaporates from the higher and cooler parts of the atmosphere to the lower and hotter parts, it contains less water and becomes more concentrated. When the temperature reaches 300 ° C, sulfuric acid begins to decompose into sulfur trioxide and water, and the products are gases. Sulfur trioxide is very active and breaks down into sulfur dioxide and atomic oxygen, which then oxidizes carbon monoxide and turns it into carbon dioxide, and sulfur dioxide and water rise from the middle to the upper atmosphere, and they react to release sulfuric acid again, and the whole process starts all over again.
Europa
Images from the Galileo spacecraft suggest that sulfuric acid may also have been present on Europa, one of Jupiter's moons, but the details are still debated.