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Thursday, May 17, 2018
China's One-Year Mock Moon Mission in Pictures | Stars Formed Only 250 Million Years After the Big Bang | Spacewalking Astronauts Replace Leaky Pump on Space Station
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angular momentum the measure of the motion of a rotating object in terms of its speed and how widely the object’s mass is distributed arou...
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Gravity is a “built-in” property of mass. Whenever there are masses in the universe, they will interact via the force of gravitational attra...
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Kepler initially assumed that the orbits of planets were circles, but doing so did not allow him to find orbits that were consistent with Br...
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