Shany Danieli, part of a team from Yale using the Dragonfly Array made observations of an ultra-diffuse galaxy, NGC 1052-DF2. Through their observations they were able to determine that it has little to no dark matter.
Ultra diffuse Galaxy: https://en.wikipedia.org/wiki/Ultra_diffuse_galaxy
TWO UNUSUAL GALAXIES SHAKE UP THE DARK MATTER DEBATE, AGAIN: https://www.wired.com/story/astronomers-have-found-two-galaxies-with-no-dark-matter/
Dragonfly telescope array:
https://www.dragonflytelescope.org/
Website:
https://www.eventhorizonshow.com/
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