Almost all we know about the universe derives from the observation of photons. We are learning some further things about the cosmos beyond the solar system by observing cosmic rays, which are mostly made up of either atomic nuclei minus their orbiting electrons, or one of their basic components, protons. But these positively charged particles do not point to their place of origin due to the magnetic fields of our galaxy which affect their flight paths like a magnet affects iron filings. What is needed for deep, sharply focused examination of the universe is a telescope that can see a particle that is not much affected by the gas, dust, and swirling magnetic fields it passes on its journey.
Neutrinos are a candidate.
When we are able to see outwards in neutrino light we will doubtless get a wondrous new view of the universe. As a result of data from the Super-Kamiokande experiment presented in 1998, we now know with high probability that some neutrinos have mass, and thus so do all the Fermions. Neutrinos were made in staggering numbers at the time of the Big Bang. There are expected to be at least 114 neutrinos per cubic centimeter, averaged over all space. There could be many more at earth because of condensation of neutrinos, now moving slowly under the gravitational pull of our galaxy.