New research shows that the planet completes a rotation on its axis roughly 9 seconds faster than scientists previously thought.
Ready for your close-up? How spacecraft changed our image of moons, planets and other objects in our solar system.
Two new books from the University of New Mexico Press feature photos from the Apollo moon landing and the one- and two-man Mercury and Gemini flights.
The 'elusive planet' Mercury kicks off the month in the midst of its best evening apparition of 2015. But Mercury isn't the only visible planet this month.
A robotic spacecraft that circled Mercury detected magnetized rocks, evidence that planet’s still-roiling, liquid metal core likely spawned a global magnetic field as far back as about 3.8 billion years ago.
At 3:26 p.m. ET today (Thursday), NASA's MESSENGER mission to the innermost planet of the solar system came to a dramatic end, smashing into Mercury's surface at a speed of over 8,700 miles per hour.
As it zoomed danger-close to small planet's surface at a mind-boggling 8,700 miles per hour, MESSENGER managed to beam one last look at the Mercurian landscape back to Earth.
The spacecraft is expected to crash onto the planet's surface at a searing 8,750 miles per hour -- fast enough to carve out a crater 52 feet wide.
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