A testable prediction about dark matter?

BBC NEWS | Science/Nature | Dark matter clues in oldest stars:

Tom Theuns, from Durham’s Institute for Computational Cosmology, told the festival: “What we found for the first time is that the nature of the dark matter is crucial to the nature of the first stars. “In cold dark matter the particles move very slowly; in warm dark matter they move very quickly,” he explained. “We found that if the dark matter consists of these fast moving particles, then the first stars form in very long, thin filaments. “The filaments have a length about a quarter the size of the Milky Way and contain an amount of matter and gas about 10 million times the mass of the Sun, so that provides a lot of fuel for many stars.” Exotic collection Some of the stars that formed within the filaments would have had a relatively low mass, which is of interest to astronomers as they have a long lifespan and could still survive today. Simulations of dark matter behaviour in the first forming stars Simulation: With cold dark matter, structures become clumpy Dr Theuns added: “In stark contrast, what happens in (the simulation with) cold dark matter is very, very different. “Here, the first stars formed in little lumps of dark matter, and just one star per dark matter lump. And these stars are probably very massive as well: 100 solar masses.

Don’t these people know you never make testable predictions about the early universe?

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