The diagram below shows the full electromagnetic spectrum. We have now observed the sky over this full range, however the spatial resolution is much different depending on the wavelength. Notice that cosmic rays are not included on here since they are not light, but instead charged high-velocity particles. We can use experiments on the ground to detect them by seeing their showers that result as they interact with particles hi up in the atmosphere. The Fly's Eye Experiment is one such example.
Gravity waves is also absent from the above plot.
These are predicted by Einstein's theory of General Relativity. We will discuss these later. Here is a good site to use. The images below show different views of the Milky Way through various eyes. These differences highlight the need to observe many different wavelengths.