Which of these could be considered as "hot dark matter"?
A)deuterium
B)weakly interacting magnetic particles (WIMPS)
C)neutrinos
D)dust close to H II regions
E)dark energy

Question

Quizplus · Accepted Answer

Neutrinos are considered "hot dark matter" because they have high speeds and do not clump together like other forms of matter, such as baryonic matter. Deuterium is a form of baryonic matter and therefore not considered "hot dark matter". WIMPS are a type of "cold dark matter", meaning they move slowly, and are not considered "hot dark matter". Dust close to H II regions is also a form of baryonic matter and therefore not considered "hot dark matter". Dark energy is not a form of matter and therefore not considered "hot dark matter". Neutrinos are considered "hot dark matter" because they were moving at high speeds (close to the speed of light) during the early universe, and have very small masses (compared to other possible dark matter particles like WIMPs and axions). This means they do not clump together as much as other types of dark matter, and therefore do not help with structure formation as much.

Which of These Could Be Considered as "Hot Dark Matter