A mystery interstellar object discovered last week is likely to be the oldest comet ever seen—possibly predating our solar ...

When the news started to spread on July 1, 2025, about a new object that was spotted from outside our solar system, only the ...

How do we know 3I/ATLAS, also called comet C/2025 N1 (ATLAS), is interstellar? Will it strike Earth? Can we visit it? Here ...

What at first seemed a routine detection of an object travelling through the solar system soon turned out to be anything but.

Astronomers have confirmed the third interstellar object on record is dashing through our solar system. Dubbed 3I/ATLAS, it ...

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A mysterious object, first observed hurtling across the solar system on July 1, has now been identified as "very likely to be ...

On July 1, scientists discovered a mysterious object hurtling through our solar system.  Nicknamed 3I/ATLAS, astronomers say ...

I/ATLAS might be over 7 billion years old, a new study reports, which would make it the oldest comet known. But experts caution we need more data.

Astronomers tracking an interstellar object flying through the solar system think it comes from a star at least 8 billion ...

As 3I/ATLAS approaches the sun, astronomers expect its frozen ices to sublimate, releasing gas and forming a glowing coma and ...

Well, it's July 12, which means (a) the Steam Summer Sale is over and (b) it's really hot outside in the northeastern U.S.