Just about 100 years ago, we didn’t know what the surface of Mars and Venus looked like. Today, we’ve evolved as a technologically advanced species, and there’s no longer a need to make guesses. We can not only observe a planet’s atmosphere but even tell what the celestial bodies in our solar system are made of.
So is it true there are oceans of liquid hydrogen on Jupiter? Does it really rain diamonds on Neptune? And are those rings around Saturn really a 1-mile [1.5 kilometers] thick?
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