May 15, 2026

A new study led by the University of Michigan has found that water in the interstellar comet 3I/ATLAS is particularly rich in deuterium. This isotope of hydrogen is relatively rare in the solar system, and the finding allows researchers to learn about planetary formation processes that operated elsewhere in the galaxy. Credit: UM News/Hans Anderson

Interstellar comet 3I/ATLAS likely formed in an environment very different from the solar system

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A study in Nature Astronomy has found that the water in the interstellar comet 3I/ATLAS is tens of times richer in deuterium than comets in the solar system. The finding suggests that the comet formed in a cold environment very different from that in which the solar system formed.

Stem cells in the gut sacrifice themselves to stop bacterial infection

A study by the Weizmann Institute and the Hebrew University reveals a new immune defense mechanism: stem cells infected with Salmonella accelerate their maturation, stop reproducing, and help save intestinal tissue.
Ferdinand Julius Cohen. From Wikimedia Commons

Ferdinand Cohen: The Jewish scientist from Breslau who laid the foundations of bacteriology

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