Jumping may protect astronauts’ knee cartilage from microgravity damage. Studies on mice show it increases bone density.

NASA on Friday confirmed that it has moved up the return of stranded astronauts Butch Wilmore and Sunita Williams to ...

YR4 has a 2% chance of hitting Earth in 2032. Astronomers are tracking it to refine estimates of its size and orbit to see how much of a risk the space rock poses.

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