There are many objects in space that we cannot see despite the fact that they emit visible light. They are just too faint. We deal with the limitations of our eyes by building telescopes and light det...There are many objects in space that we cannot see despite the fact that they emit visible light. They are just too faint. We deal with the limitations of our eyes by building telescopes and light detectors. These tools, like many of the tools we build, help us expand our physical capabilities beyond what is possible by our bodies alone. In this section, we look at telescopes, our “eyes on the sky.” Our purpose is to illustrate how different telescopes are used, as well as some of the physical l
