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Triplet of ‘Ghostly’ Galaxies Hints at What Dark Matter Is — and Isn’t
Quanta's Robin George Andrews reports on DF2, DF4 and DF9, three diffuse galaxies with almost no dark matter. A June 2026 Astrophysical Journal paper proposes they formed after an ancient collision separated ordinary matter from dark matter, which many researchers say supports dark matter as a physical substance and spells trouble for modified-gravity theories like MOND.
7 min · 1,623 words
Black Holes or Black Hole Stars? Astronomers Spar Over Webb Telescope's Little Red Dots
Charlie Wood explains the debate over James Webb's mysterious little red dots: whether they are standard supermassive black holes or black hole stars—colossal hydrogen shells powered by hidden black holes—and what that would mean for how the first big black holes formed.
12 min · 2,798 words