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Space
Astronomers Pin Down a Tiny Jupiter Moon, and Give JUICE a Target to Consider
Kallichore is not the kind of moon that makes it onto posters. Less than four kilometers across, it circles Jupiter at hundreds of millions of kilometers from Earth, one of dozens of small, dark…
By Victor Kuklin1mo ago3 min read
Space
Listening to a Failed Star's Magnetic Hum: A Rare Field Measurement for a Cold Brown Dwarf
A brown dwarf never quite made it as a star. Too heavy to be a planet, too light to sustain the hydrogen fusion that powers the Sun, it spends its life slowly cooling. The coldest of them, the…
By Diana Brinker1mo ago3 min read
Space
A Comet Older Than the Sun: 3I/ATLAS's Atoms Point to an Ancient Star
Every atom carries a kind of birth certificate. The exact mix of heavier and lighter versions of an element, its isotopes, is set by where and when that material was forged, and it barely changes…
By Victor Kuklin1mo ago4 min read
Space
The Hidden Engine Behind a Ghost-Particle Blazar
In September 2017, a single subatomic particle ended a several-kilometre journey deep in the Antarctic ice and set off the detectors of the IceCube observatory. Tracing its path backward across the…
By Kristopher R. Jeffay2mo ago3 min read