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Physicists have successfully observed quantum objects obeying gravity by sending 20,000 atoms into free fall, validating a prediction from 1927.
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A new mathematical theory proposes a solution to a fundamental cosmic paradox by linking gravity and entropy to explain the emergence of cosmic order.
A physicist warns that pervasive Martian dust may be the overlooked obstacle threatening Elon Musk's plans for human colonization of Mars.
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