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FAST finds two mysterious hydrogen clouds with no visible stars
The yellow circles indicate the locations of the two RELHIC candidates: Cloud N and Cloud S. The color shows the H I column density (moment 0) map.
AI Summary
Astronomers using China’s Five-hundred-meter Aperture Spherical Telescope (FAST) have identified two massive hydrogen clouds near the Whirlpool galaxy. Each cloud holds about three million solar masses of hydrogen but shows no detectable optical counterpart, indicating an almost complete absence of stars. The discovery highlights the existence of large, star‑free gas structures in the vicinity of a well‑studied galaxy.
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