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science · 3 outlets · 3 linked reports

Astronomers Confirm a Third Galaxy With Almost No Dark Matter

2026-07-06

AI-assisted: summaries and questions may be incomplete or incorrect. Verify important details with the linked original reporting.

Summary

A Yale-led team using the W. M. Keck Observatory confirmed NGC 1052-DF9, the third known galaxy that appears to lack dark matter.
About 67 million light-years away, DF9's mass is accounted for entirely by its visible matter, based on how its stars move.
It sits on a straight line with two other dark-matter-free galaxies (DF2, DF4), supporting a 'bullet dwarf' collision origin — and it was predicted before it was found.

The question

A chain of dark-matter-free galaxies points to a violent collision that stripped ordinary matter loose.

Original reporting

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