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21 Nov 2017
Pierre Gassendi uses a telescope to watch from Earth as Mercury passes the face of the sun.
After thinking for centuries, one side of Mercure always faced the sun, scientists find the planet rotates three times for every two orbits.
Mariner 10 became the first spacecraft to visit Mercury.
Scientists using Earth-based radar find signs of ice locked in permanently shadowed and cold areas of craters in Mercury's polar regions.
MESSENGER became the second spacecraft to visit the innermost planet. MESSENGER makes three fly-bys before settling into orbit.
MESSENGER settles into orbit on a mission that will finally reveal all of the surface of Mercury.
MESSENGER completes the first-ever global map of Mercury.
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