NASA launched its Active Magnetospheric Particle Tracer Explorers mission (AMPTE) from the Cape Canaveral launch pad.
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Russia's Mir Space Station was deorbited over the South Pacific Ocean.
Astronomer Richard Walker discovered Saturn's moon, Epimetheus.
NASA's Spitzer Space Telescope discovered a star with seven Earth-sized planets orbiting it.
Israel launched its first satellite, Ofek-1, from the Palmachim Air Base.
A Neptune-sized exomoon became the first one discovered outside the Solar System.