When NASA's Juno probe arrived at Jupiter on Monday, it joined a far-flung assortment of unmanned spacecraft collecting scientific data about planets, comets, asteroids and other interplanetary phenomena. Their missions are varied, but share fundamental goals: to help make sense of the universe and our place in it.
This Japanese orbiter failed in its first attempt to reach Venus, and spent five years spinning around the sun before getting another chance in December. That time, it worked, and Akatsuki — Japanese for "dawn" — has been circling Earth's closest planetary neighbor since. Its mission is to study Ven...
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