A simple breakdown of the new 3I/ATLAS pulsing discovery and why scientists are checking if Callisto might be affected.

The interstellar comet 3I/ATLAS has started to brighten and dim in a remarkably steady rhythm, repeating every 16.16 hours as ...

Astronomers detect a 16.16-hour pulse from interstellar object 3I/ATLAS but say the brightness rhythm poses no risk to ...

If there was a contest for the most interesting moon in our solar system, Callisto would be a contender. Jupiter's second-largest moon has more impact craters on its surface than any other planetary ...

NASA reveals the true, bizarre reason for the 3I/ATLAS comet's 16.16-hour pulse. Scientists link the interstellar object's ...

New evidence from an old NASA mission supports the theory that Jupiter's moon Callisto is in fact an ocean world. A moon of Jupiter about the size of Mercury likely has a several-miles-deep ocean ...

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The Moon passes 5° north of Jupiter at 9 A.M. EDT. Just six percent illuminated by this evening, you can try to spot the young crescent Moon hanging above the gas giant in the western sky after sunset ...