We may receive a commission on purchases made from links. Depending on when you grew up, you might have owned (or wanted) a projector that lit up your bedroom ceiling with a starry night sky.

Since the discovery that some USB TV tuner dongles could be used to monitor radio waves across a huge amount of spectrum, the software-defined radio world has exploded with interest. The one limiting ...

Depending on when you grew up, you might have owned (or wanted) a projector that lit up your bedroom ceiling with a starry night sky. Technology has evolved by leaps and bounds in recent years, and ...