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Four astronauts spent 3 days in space. Here’s what it did to their bodies and minds.

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Space changes you, even during short trips off-planet. Four people who spent three days outside Earth in September 2021 experienced physical and mental changes that included modest declines in cognitive tests, heightened immune systems and genetic changes within their cells, scientists report in a suite of papers published Tuesday in the journal Nature and some. … Read more

A “once-in-a-lifetime” cosmic explosion is likely this summer, NASA says. Here’s what you need to know.

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A rare burst of light from a dead star is likely to be visible to humans in earth this summer in a fleeting but potentially gloomy celestial display that scientists are calling “a once-in-a-lifetime event.” The technical term for the impending cosmic explosion is nova, which occurs when a white dwarf suddenly and often spectacularly … Read more