No aiming, they just look for collisions between neutrinos and atoms in the surrounding ice. Collisions are relatively rare, since almost all neutrinos go straight through the Earth. With a billion or so square meters of ice to look at, and neutrinos constantly zipping through Earth, they hope to see one collision every 20 minutes.
I understand that, but if it’s a telescope they have to be “looking” at something in space, so how do they know what they’re “looking at” if it’s not aimed at something?
It’s not a study of neutrinos it’s a study of the source of neutrinos, just like an optical telescope is not a study of photons, but a study of the body that emitted (or reflected, as in the case of planets) those photons.