Astronomers have discovered that massive dust discs surrounding supermassive black holes at galaxy centers could spawn millions of planets, according to research appearing in New Scientist.
The dust swirling around active galactic nuclei, known as accretion discs, contains sufficient material and the right conditions to form rocky planets through a process similar to planetary formation in young stellar systems. These discs extend hundreds of millions of miles from the black hole and contain gas, dust, and stellar debris. Some planets forming in these extreme environments could reach sizes comparable to stars themselves.
Researchers modeling these discs found that planet formation occurs within a narrow but vast region where temperatures and densities allow dust grains to clump together. The sheer volume of material in galactic accretion discs means that even inefficient planet formation would produce enormous numbers of worlds. Traditional wisdom held that radiation from the violently active black hole would prevent planet formation, but new calculations suggest formation occurs in cooler outer regions of the disc where radiation pressure remains manageable.
These planets would inhabit an alien environment unlike anything in Earth's solar system. They would orbit at tremendous distances from their host black hole, taking millions of years to complete a single orbit. The intense gravitational forces, relativistic effects, and energetic radiation from infalling matter create a hostile context for planetary development and stability.
The research addresses fundamental questions about planet ubiquity across the universe. If millions of planets genuinely form around supermassive black holes, planetary systems may be vastly more common than previously assumed. However, the actual survival of these planets remains uncertain. Most likely disperse into space rather than settling into stable orbits.
The study represents theoretical work based on computational models rather than direct observations. Detecting planets near active galactic nuclei presents extreme observational challenges due to dust obscuration and the tremendous distances involved. Future telescopes may eventually confirm whether these theoretical predictions match