Astronomers have found two clouds of hydrogen near the Whirlpool galaxy that appear to contain almost no stars. The clouds, discovered with China's FAST radio telescope, each contain roughly 3 million times the mass of the sun in hydrogen but have no detectable optical counterpart. Their proper...

Source: [Phys.org](https://phys.org/news/2026-09-fast-mysterious-hydrogen-clouds-visible.html)

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