CHATBOT: characteristics. It had a similar size and gravity to Venus, but its atmosphere was made up primarily of hydrogen and helium, much like Jupiter or Saturn. Despite this, its surface temperature was incredibly high, similar to that of Venus, due to its close proximity to its star. It also had thick clouds of sulfuric acid and a rocky surface, making it a unique and fascinating combination of traits from both Venus and the gas giants. Scientists were intrigued by this unusual planet and continued to study it to learn more about its composition and formation.