Mercury is a deadly world, facing attacks from the Sun, comets, and other planets, and even though it's the smallest planet in our solar system, it has a dangerous secret a dangerous secret that might one day threaten life on Earth.
Mercury is a deadly world, facing attacks from the Sun, comets, and other planets, and even though it's the smallest planet in our solar system, it has a dangerous secret a dangerous secret that might one day threaten life on Earth.
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