
Tiny ball bearings surround a larger central bearing during the Fluid Particles experiment, conducted inside the Microgravity Science Glovebox (MSG) aboard the International Space Station’s Destiny laboratory module. via NASA https://ift.tt/SfbP3Qy
A portion of the Moon’s far side is seen along the terminator—the boundary between lunar day and night—where low-angle sunlight casts long ...
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