The curious minds at What If explore what would happen if Earth’s entire population lived in the same skyscraper.

Artist's illustration showing a star behind a shattered comet. A faraway star's mysterous dimming was most likely caused by comets, a new study suggests — though it doesn't rule out the ...

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How do you explain an outer space discovery that confounds even astronomers? Blame it on aliens. At least that often seems to be the first reaction when such mysteries arise. KIC 8462852 was first ...

The mystery of why a distant star keeps dimming continues to baffle scientists, after a new report ruled out several "natural" explanations. The astronomical world lit up last year, after planet ...

Add Yahoo as a preferred source to see more of our stories on Google. Archaeologists in Romania have uncovered portions of an ancient megastructure from around 6,200 years ago. The oak-floor building ...

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Let's just call it the alien megastructure that wasn't. More than 100 researchers have released a study showing that the mysterious star KIC 8462852, better known as Tabby's Star, is almost certainly ...