By the time other telescopes point to the object, it has grown too faint to be detected. The differing wavelengths among the various energies create different instrumental needs. This results in dissimilar, incompatible detecting devices. The electromagnetic spectrum. Radio has long wavelengths and low energies, while gamma rays have very short wavelengths and high energies.
Telescopes rely on the interaction between energy and matter.
The atomic matter that forms the telescope has to somehow interpret the energy emitted from astronomical objects. This energy is in the form of electromagnetic waves. Although the first telescope was created 400 years ago, we didn't have a complete picture of the electromagnetic spectrum until the early part of this century. As our knowledge of physics improves, scientists are able to develop increasingly superior telescopes. Most of the universe is invisible to us because we only see the visible light portion of the electromagnetic spectrum.