James Webb Space Telescope reveals that most galaxies rotate clockwise
New James Webb Space Telescope data suggest that more distant spiral galaxies appear to rotate in one direction relative to the Milky Way, challenging expectations that spins should be randomly distributed in an isotropic universe. Commenters probe what “clockwise” even means in cosmology, explore speculative explanations such as a rotating universe or our cosmos existing inside a black hole, and relate the claim to other observed asymmetries like matter–antimatter imbalance. Many remain cautious, noting the small sample size, modest statistical significance, and the lead author’s contested prior work, and call for larger, independent surveys before revising standard cosmological models.
What “clockwise” means and why it’s surprising
- Commenters stress that “clockwise” is observer‑dependent; from the opposite side the same galaxy spins counterclockwise.
- The meaningful claim is statistical: we’d expect roughly a 50/50 split of spin directions for randomly oriented galaxies in an isotropic universe.
- The underlying paper actually says ~60% of 263 JWST galaxies rotate opposite to the Milky Way, ~40% the same way, a ~3.39σ result.
- Several note that determining spin by image morphology is hard and often subjective, hence the use of ML; that itself raises questions about bias.
Black‑hole cosmology and global rotation
- Many latch onto the article’s suggestion that a preferred spin axis could mean our universe is inside a spinning black hole, inheriting its angular momentum.
- There is extended discussion of what “inside a black hole” means (event horizon vs singularity, singularity as “in the future,” lack of stable orbits inside) and whether this is compatible with what we observe.
- Others point out that this is a speculative idea with no direct evidence and risks infinite regress (“turtles all the way down” with nested universes/black holes).
Alternative and more mundane explanations
- Another proposed explanation in the article: miscalibrated assumptions about the Milky Way’s motion and rotation, producing selection or brightness biases (via Doppler/relativistic beaming).
- People debate whether such effects can really change the total brightness of a whole galaxy enough to explain a ~60/40 split.
- Some suggest local structure (e.g., supercluster dynamics) or early‑universe asymmetries (quasars, magnetic fields, turbulence) as more plausible than black‑hole cosmology.
Skepticism about the result and methodology
- Multiple commenters flag that 263 galaxies from a tiny sky patch is a very small sample, and 3σ is modest; many expect the effect may vanish with more data.
- Others cite follow‑up work by astronomers that found no significant global spin anisotropy and critique similar past claims by the same solo (non‑astronomer) author as inconsistent or methodologically weak.
- Overall sentiment: interesting anomaly if real, but current evidence is thin and likely over‑hyped by the popular article.
Broader cosmological and philosophical threads
- Long side discussions cover:
- Observable vs entire universe, light cones, expanding space, and why every observer is “at the center” of their observable sphere.
- The cosmological and Copernican principles (no preferred places or directions) and how repeated asymmetries (matter–antimatter, molecular chirality, spin bias) might challenge them.
- Whether unobservable regions “exist” in a scientific sense, and the limits of testability in modern cosmology.