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When will Mars be close to Earth?

As neighboring planets, Earth and Mars have a few things in common. Both are terrestrial in nature (i.e. rocky), both have tilted axes, and both orbit the sun within its circumstellar habitable zone. And during the course ...

dateApr 10, 2017 in Space Exploration
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How did the proton get its spin?

Calculating a proton's spin used to be an easy college assignment. In fact, Carl Gagliardi remembers answering that question when he was a physics graduate student in the 1970s. But the real answer turned out not to be simple ...

dateMar 31, 2017 in General Physics
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Image: The splitting of the dunes

The mound in the center of this Mars Reconnaissance Orbiter (MRO) image appears to have blocked the path of the dunes as they marched south (north is to the left in this image) across the scene. Many of these transverse dunes ...

dateMar 30, 2017 in Space Exploration
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