Fast Radio Bursts
Fast radio bursts (FRBs) are flashes of radio energy in the sky that last only a few thousandths of a second. They appear to originate from beyond the Milky Way Galaxy and, as such, contain prodigious amounts of energy. They were discovered in 2007 by astronomers using data gathered with the Parkes radio telescope in Australia.
Pulsars
In 1967, PhD student Jocelyn Bell discovered an unusual radio signal, one containing a pulse that repeated with very high precision every one-and-a-third seconds. The subsequent discovery of similar signals, two of which came from supernova remnants, convinced astronomers that the signals were coming from rapidly rotating neutron stars.