The big-particle hypothesis suggests that the dark matter in the universe is made up of big particles that are light years across.
The two leading figures of this hypothesis, Tonatiuh Matos and Luis Ureña López , suggest this to explain why astronomers see fewer subgalactic gas clouds and small galaxies than simple extrapolation from galatic clusters would suggest. Large particles of dark matter would tend to clump on galactic scales but resist clumping on smaller scales.
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