When you look at the night sky, do you ever wonder what's going on out there? On a clear night with a dark sky, if moonlight doesn't wash it out, sometimes you can see the arc of the Milky Way. The ...

Modern telescopes, such as the powerful and multi-talented JWST, sometimes use both lenses and mirrors: a type of hybrid design called catadioptric. Some even use layered concentric mirrors that make ...