Prefer Newsweek on Google to see more of our trusted coverage when you search. Twelve years ago, astronomers confirmed the detection of the first-known natural object to orbit Earth other than the ...

A striking new image of the interstellar object 3I/ATLAS has deepened scientific intrigue after astronomers reported evidence of narrow, X-shaped jets that may indicate the object is breaking apart.

New images capturing unusual, sideways streaks near the object have revived debate over whether the comet is shedding natural fragments, or something more unusual. The discussion intensified this week ...

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Planet-making disks of gas, dust, and ice are known to form around stars and brown dwarfs. But now, disks with the potential to form planets, or at least moons, have been found outside the solar ...