Which of the following is NOT a possible candidate for dark matter?
A) axions
B) positrons
C) photinos
D) neutrinos
E) None of the above; all of these could be dark matter.

Question

Quizplus · Accepted Answer

Positrons are not a candidate for dark matter because they are a type of antimatter and would annihilate with regular matter if they were present in large quantities in the universe. The other options (axions, photinos, and neutrinos) are all potential candidates for dark matter.

Which of the Following Is NOT a Possible Candidate for Dark