British astronomer William Lassell discovered Neptune’s largest moon, Triton.
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Frederick Langenheim took the first photo of a solar eclipse.
The Japanese Space Agency sent two robots to explore an asteroid aboard their Hayabusa-2 spacecraft.
Astronomer William Herschel first observed Uranus.
The Hubble Space Telescope captured the first images of the surface of Pluto.
Cosmonaut Alexey Leonov made the first spacewalk when he left his Voskhod 2 spacecraft.
