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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
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