Why are astronomers interested in building observatories capable of detecting neutrinos, cosmic rays, and gravitational waves?
a. these things are the highest energy forms of light, even more energetic than gamma rays, and therefore can tell us about explosive processes in the universe.
b. these things are emitted from the same objects that emit x rays, but unlike x rays, they can be detected with observatories on the ground.
c. these things should in principle be much easier to detect than light, which means we could build these observatories cheaply.
d. these things are not forms of light, and therefore can provide different types of information than light about objects that emit the

The reason why astronomers interested in building observatories capable of detecting neutrinos, cosmic rays, and gravitational waves is because:

d. These things are not forms of light, and therefore can provide different types of information than light about objects that emit the

Explanation:

Cosmic rays are composed of pure energy that travels at the speed of light and that can be measured according to the amount of energy they have as well as the speed they travel.

Neutrinos are also composed of energy however they are specifically composed of radioactive decays. This allows scientists to measure them even though they can go through almost everything without being noticed.

Gravitational waves are disturbances generated in the curvature of space that expand from their origin at a certain rhythm or "force" that travels at the speed of time.

So because all of them can be measured without being light they are optimal to be found in the space to create more knowledge about the universe.