Question: PRS - C 2 2 - & 2 3 - L 1 : Assuming WIMPs really exist and make up most of the dark matter

PRS-C22-&23-L1: Assuming WIMPs really exist and make up most of the dark matter in the universe, which of the following is not one of their characteristics?
They travel at speeds extremely close to the speed of light.
They could show gravitational lensing effects.
They are frictionless particles as they don't emit thermal radiation.
Besides gravitational attraction, they don't really interact with other matters.
They are massive particles.
PRS - C 2 2 - & 2 3 - L 1 : Assuming WIMPs really

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