“Radio Astronomy: Observing the Invisible Universe” S:1 E:12 Foot Telescope

S:1 E:12 Foot Telescope Humans constantly use radio transmission these days, for everything from military communications to garage-door openers. How can scientists determine which signals come from Earth and which come from space? Learn how the 300-foot telescope was built quickly and cheaply. It ended up studying pulsars and hydrogen in distant galaxies, and made the case for dark matter.