Before Hubble, quasars were considered to be isolated star-like objects of a mysterious nature. Hubble has observed several quasars and found that they all reside. Shining so brightly that they eclipse the ancient galaxies that contain them, quasars are distant objects powered by black holes a billion times. Quasars. Astronomers first knew they had a mystery on their hands in the s when they turned the first radio telescopes to the sky. Because they are so distant, they are apparently stationary to our current technology, yet their positions can be measured with the utmost accuracy by Very Long Baseline Interferometry VLBI. The brightest known quasars devour solar masses of material every year. Containing many unknown broad emission lines, the anomalous spectrum defied interpretation — a claim by John Bolton of a large redshift was not generally accepted. These lines are brighter than the continuous spectrum, so they are called 'emission' lines. Quasars show evidence of elements heavier than helium , indicating that galaxies underwent a massive phase of star formation , creating population III stars between the time of the Big Bang and the first observed quasars. The largest known is estimated to consume matter equivalent to Earths per minute. Explore the BBC Home Home News News Sport Weather Shop Earth Travel Capital iPlayer Culture Autos Future TV Radio CBBC CBeebies Food iWonder Bitesize Travel Music Earth Arts Make It Digital Taster Nature Local. In the early 's, quasars were referred to as radio stars because they were discovered to be a strong source of radio waves. If you find the content in the 'About' section factually incorrect, defamatory or highly offensive you can edit this article at Wikipedia. I love it when scientists discover something unusual in nature. Other classes include Seyfert galaxies and blazars. In a universe containing hundreds of billions of galaxies, most of which had active nuclei billions of years ago but only seen today, it is statistically certain that thousands of energy jets should be pointed toward the Earth, some more directly than others.