This deep Hubble Space Telescope image reveals the diffuse dwarf galaxy NGC2052-DF2, an unusual “see-through” galaxy. The giant cosmic cotton ball is so diffuse and its ancient stars so spread out that distant galaxies in the background can be seen through it. Astronomers measured the luminosities of faint stars at the tip of the red giant branch in this galaxy to improve the accuracy of its distance and to conclude that, in agreement with earlier studies, it does appear to be very deficient in dark matter. Credit: Science: NASA, ESA, STScI, Zili Shen (Yale), Pieter van Dokkum (Yale), Shany …
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