Today, we know of Mars as a cold, dry desert, with patches of subterranean ice and ice caps at its poles. Billions of years ...

Artist's concept of light flares along Sag A*'s accretion disk. (Credit: NASA, ESA, CSA, Ralf Crawford (STScI)) ...

Celebrate Black History Month with a good book. Our readers recommended 50+ stories to dive into this February and beyond.

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A core group of so-called disease detectives, who track outbreaks, was apparently spared. But other young researchers are out ...