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The largest volcano in the solar system is on Mars – it’s called Olympus Mons and it’s 3 times taller than Mount Everest. Neutron stars are so dense that a sugar-cube-sized amount would weigh a billion tons. Astronauts can grow up to 2 inches taller in space because their spine stretches without gravity. Jupiter’s Great Red Spot is a storm bigger than Earth that has lasted for centuries. There are more stars in the universe than grains of sand on Earth.