Than are dreamt of in your philosophy. Hamlet, Act I, scene v Conventional astronomy tells a curiously simple story about the Universe. Essentially, it is the story of stars, which take centre stage simply because they produce almost all the visible light which reaches us from space.
Radio astronomy gives a radically different perspective.
Normal stars produce almost no radio waves, and in their absence the exquisite sensitivity of radio telescopes reveals a radio sky that seems to belong to another universe. It is dominated by the great swath of our Galaxy, which far outshines the radio sun. Some of the largest and brightest are Galactic nebulae which can also be seen with optical telescopes, but the majority lie far outside our Galaxy. These extragalactic radio sources are associated with distant galaxies. Over the years, many different types of extragalactic radio source have been discovered, but we have gradually realized that nearly all of them fall into two great families.