1.As a key factor of the structure formation of the universe,the existence of dark matter has been widely accepted"Dark matter"refers to a kind of matter in the universe which has gravitational effects,but has no direct interaction with light.It is deemed to be composed of completely new particles beyond the standard model of particle physics,however we know very little about the nature of dark matter.At the beginning of the 20th century,the"two clouds"in physics sky–aether and blackbody radiation–overturned the classical physics theory and gave birth to quantum mechanics and the theory of relativity.Similarly,dark matter,together with dark energy,are called the"two clouds"in the physics sky of the
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