We’ve Been Wrong About Black Holes | New Scientist

The Gist

The title promises a revolution in what we know about black holes. The real answer is that supermassive black holes grow through cosmic evolution alongside their host galaxies, and recent James Webb Space Telescope data challenges existing timelines.

Quick Overview

Supermassive black holes and their host galaxies co-evolve, and recent observations reveal massive black holes existing much earlier in cosmic history than traditional growth models permit. Oxford astrophysicist Dr. Becky Smethurst sits down with New Scientist features editor Jacklin Kwan to break down the mechanics of black holes, accretion disks, dark matter, and how radio astronomy and space telescopes drive modern physics.

Key Points: Every galaxy hosts a supermassive black hole at its center, with masses ranging from millions to billions of times the mass of the sun. Black holes are defined as everything inside the event horizon, a spherical boundary from which no light or information escapes. Galaxies and their central black holes co-evolve, showing clear correlations between galaxy mass and black hole mass based on stellar orbits. Acquisition disks around supermassive black holes heat up as material spirals inward under extreme gravity, creating the glowing rings observed by telescopes. Recent James Webb Space Telescope surveys discovered supermassive black holes of one billion solar masses existing merely 800 million years after the Big Bang, defying standard growth timelines. Dark matter remains essential because standard galactic rotation and formation models fail without cold dark matter supplying the underlying gravitational framework. Hawking radiation theorizes that black holes can slowly dissipate by producing particle pairs at the event horizon, though the emission rate is extremely slow.

Context: Astrophysicist Dr. Becky Smethurst of the University of Oxford discusses the state of black hole research with New Scientist features editor Jacklin Kwan. The conversation explores galactic evolution, the limits of Einstein's theory of general relativity, and how cutting-edge space telescopes like James Webb and Rubin observatory continue to reshape our understanding of the early universe.