Seven years after a star's 1987 explosion in the large Magellanic Cloud galaxy a new view shows three rings. Astronomers have a suspicion that the two big rings mark where unltraviolet radiation from the supernova illuminates a thin hour-glass shaped bubble of gas and dust produced 10,000 to 20,000 years ago by a dying star. A smaller bright ring of material circles its equator. Radio Stars Our Sun not only sends out light and heat, it also sends out waves of energy called radio waves. We use the same kind of waves to send signals from a transmitter to a radio receiver.
Most stars send out radio waves, but some send out more.
About 20 years ago, radio astronomers discovered a new type of star. It sends out short bursts or pulses of radio waves. The time between pulses ranges from a fraction of a second to almost four seconds. Star A comet is a large lump of frozen gas mixed with bits of dust. When the comet goes near the sun the frozen part melts.