[Styropyro’s] handheld, DIY laser rifle, or Laser Telescope Blaster as he calls it, works for long distances. His solution lies in some surprising physics: the larger the diameter of the beam ...

Building a simple Galilean telescope (about 9x magnification) To build a simple cardboard Galilean telescope with a magnification of approximately 9x, your materials will need to have the ...

With modern electronics, it is relatively easy to build your own radio telescope. To understand how it can be done, check out a recent paper by Jack Phelps posted to the arXiv preprint server.