Description how well is yours knowledge about astronomy Start typing your answer here: which planet was discovered in 1930 the Trojans are groups of asteroids that move in the same orbit as one of the planets. which planet? how many moons does saturn have? mercury orbits the sun once every 88 days. how long does it take for mercury to rotate once on its axis? which planet is known as the Horned planet? who discovered the planet Uranus? which planet has the least density? Time left
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