Q. Which is the second most abundant subatomic particle in the universe?
Answer: Neutrino
Notes: Neutrinos are highly abundant (second after photon), with a billion passing through a cubic centimeter of space every second. Their lack of electric charge and minimal interaction with matter allow them to traverse long distances in the universe without absorption or deflection. The study of neutrinos contributes to our understanding of astrophysical phenomena like supernovae and dark matter. They help in investigating regions of space otherwise concealed due to dust and gas. The information gleaned from neutrinos helps to enhance our comprehension of the universe's structure and tendencies.

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