What are 3 heavenly bodies that were discovered using radio waves?

Pulsars: These are rapidly rotating neutron stars that emit regular pulses of radio waves. They were discovered in 1967 by Jocelyn Bell Burnell and Antony Hewish.

Quasars: These are extremely luminous active galactic nuclei that are powered by supermassive black holes. They were discovered in 1963 by Allan Sandage and Thomas A. Matthews.

Masers: These are natural microwave lasers that are found in regions of space where there is a high density of molecules. They were discovered in 1965 by Arno Penzias and Robert Wilson.