# 'Stupendously large' primordial black holes ruled out as a dark matter source

Source: [Space News - Space, Astronomy, Space Exploration](https://phys.org/news/2026-11-stupendously-large-primordial-black-holes.html) · 2026-11-08 · Space
Page: https://themorning.science/story/stupendously-large-primordial-black-holes-ruled-out-as-a-dark-matter-source-2154305b5600b913
Kind: research · Impact: medium

## In brief

- An analysis of Planck's cosmic microwave background observations finds no signature of extremely massive primordial black holes.
- The result excludes such black holes as a significant component of dark matter.
- Primordial black holes are hypothetical objects that could have formed directly from dense clumps of matter in the very early universe.

## Why it matters

The result narrows the set of viable dark matter candidates and constrains models of how black holes could have formed in the early universe, which matters for science readers following cosmology and dark matter research.

## Coverage

- ['Stupendously large' primordial black holes ruled out as a dark matter source](https://phys.org/news/2026-11-stupendously-large-primordial-black-holes.html) — Space News - Space, Astronomy, Space Exploration, 2026-11-08
- [Planck data rule out enormous primordial black holes as major dark matter source](https://www.nanowerk.com/news2/space/newsid=70559.php?utm_source=rss&utm_medium=rss) — Nanowerk Nanotechnology and Emerging Technologies News, 2026-11-06

Tags: primordial black holes, dark matter, cosmology, planck, cosmic microwave background

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