Fraser Cain on Nostr: Many amateur astronomers have built their telescopes, even grinding the mirrors. But ...

Many amateur astronomers have built their telescopes, even grinding the mirrors. But there are so many photon choices across the electromagnetic spectrum. A new paper provides instructions for building a backyard radio telescope that can detect the emission of hydrogen in the 21 cm line. This is a specific wavelength of radio waves emitted by vast clouds of neutral hydrogen that can pass through gas and dust. You can even use this during the day or in light pollution.

https://arxiv.org/abs/2411.00057