Pluto is 1/6th the size of Earth, but it has 5 moons. Jupiter has 67. Why does the Earth have just 1 moon?
Newly released pictures, taken when Dawn was about 4,500 miles from Ceres, confirm that the bright areas are patches of sunlight bouncing off ...something.
An innovative concept for tiny probes attached to gliders could one day allow small robots to explore intricate locales on Mars that probes never could reach before.
Having already discerned the dwarf planet has distinct surface features, NASA's New Horizons mission has now spotted not just Pluto's largest moons, but the smallest natural satellites too.
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.
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.
Strange and violent events maybe taking place on Pluto -- just in time for the New Horizons spacecraft to take a closer look.
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