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Astrophysics & Cosmology
Black holes, dark matter, gravitational waves, and the big‑picture universe.
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Latest in Astrophysics & Cosmology
What Is Humanity’s Place in the Cosmos?
4+ hour, 18+ min ago (1467+ words) A lifelong fascination with terra incognita led the astrophysicist Priyamvada Natarajan to map out the universe’s most enigmatic phenomena....
Strange Seeds Appear to Be Growing Into Massive Black Holes
5+ hour, 20+ min ago (492+ words) Published Sep 20, 2026 8:00 AM EDT For years now, scientists have been puzzled by the existence of “little red dots” first showing up in observations by NASA’s James Webb Space Telescope. These objects appeared in a region they believe dates to just…...
Scientists outline how spacecraft could reach a nearby black hole within a century
5+ hour, 29+ min ago (1094+ words) A physicist outlines how laser-driven nanocraft could someday reach a nearby black hole and test gravity directly. (CREDIT: Wikimedia / AI-Generated / CC BY-SA 4.0) The idea would require a suitable black hole to be discovered surprisingly close to Earth, along with technologies…...
Black Hole “Burps” May Follow the Same Rule Across the Universe
5+ hour, 57+ min ago (242+ words) ...
Scientists opened a sealed envelope after 10 years. Gravity still didn’t make sense
6+ hour, 49+ min ago (1342+ words) A decade-long NIST experiment has produced a new measurement of the universal gravitational constant that differs unexpectedly from another leading result, deepening a 225-year-old physics puzzle. The discrepancy is tiny, but for one of nature’s most fundamental constants, it is…...
Twenty-two years of X-ray timing suggest the disk around pulsar 4U 1626−67 may have flipped from rotating backward to forward in 2008, turning years of spin-down into spin-up — though the evidence remains indirect.
6+ hour, 47+ min ago (1104+ words) A state-space analysis of 3,340 pulse-frequency measurements slightly favors a retrograde disk before 4U 1626−67's 2008 torque reversal, but a data gap and weak Bayesian odds keep the result indirect....
Cosmically Curious: What holds the universe together? All about fundamental constants
7+ hour, 40+ min ago (365+ words) Ever wondered what holds the universe together? In this episode of Cosmically Curious, host Patrick McNamee King sits down with UNH astronomer John Gianforte to explore the fundamental constants of nature — the universal rules and numbers that define reality, set…...
A New Helium Measurement Is Testing the Universe’s First Five Minutes
1+ day, 3+ hour ago (357+ words) Helium, a light chemical element, carries clues to what the universe was like during its first five minutes. To read that record, an international team turned to 15 small, remote galaxies whose chemistry has changed very little, preserving a composition close…...
Webb Telescope may have uncovered ancient stars powered by dark matter
1+ day, 10+ hour ago (625+ words) Dark stars are candidates for the first stars that formed in the Universe, powered by dark matter. Researchers examining high-redshift objects in Webb Telescope data have detected what could be dark stars from the cosmic dawn. Dark stars are candidates…...
Inflationary Cosmology: Various Cosmologies, Various Possibilities | Episode 2｜frog001
2+ day, 16+ hour ago (59+ words) Various Cosmologies, Various Possibilities | Episode 2: Inflationary CosmologyThe "Standard Big Bang Theory" mentioned in Episode 1 determined that the universe was a fireball in the past. However, behind that success remained "two serious unnatural aspects" that could not be explained by the…...