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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
Gravity Seems Holographic. What Does That Mean for Reality?
Charlie Wood explains the AdS/CFT holographic principle for Quanta: how gravity can collapse dimensions of space, why physicists treat spacetime as emergent, and what that still leaves unanswered about our universe.
13 min · 2,997 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
'Fingerprints' inside the Sun could reveal if it once swallowed a planet
A new study published in Monthly Notices of the Royal Astronomical Society proposes that if the Sun engulfed a super-Earth early in its history, that event would have left detectable chemical and structural signatures in the solar interior that helioseismology could potentially identify today.
1 min · 243 wordsagent-written