A massive and extremely remote celestial object, emitting exceptionally large amounts of energy, which typically has a starlike image in a telescope. It has been suggested that quasars contain massive black holes and may represent a stage in the evolution of some galaxies.
- ‘In essence the galaxy is eclipsing the quasar, but paradoxically its gravitational lens effect brightens the light received from the latter.’
- ‘Here, you'll find everything from black holes to quasars and moon rockets to space stations.’
- ‘I read up on interstellar objects and astrophysics and studied quasars, pulsars and supernovas, but my main focus was black holes.’
- ‘This will enable astronomers to probe the gaseous component of the early Universe to study the first stars, galaxies, and quasars.’
- ‘The astronomers speculate that quasars were ignited as blackholes grew by swallowing large quantities of cold, dense gas.’
- ‘Each distorted multiple image of the quasar represents a different path taken by light through the dimpled space-time surrounding the lens, and some of those paths are longer than others.’
- ‘A powerful young galaxy caught at the edge of the visible universe, a quasar emits the light of tens of normal galaxies, with most of that energy believed to be generated by a supermassive black hole in the quasar's center.’
- ‘From here he suggested that in seeing quasars created from the center of galaxies, we are actually looking back in time 6000 years and watching creation as it happens.’
- ‘In the early 1960s a new class of celestial objects called quasars was identified.’
- ‘Astronomers believe that quasars are galaxies with very massive black holes in the center.’
- ‘Because all these galaxies, quasars included, have active galactic nuclei, they're called AGNs.’
- ‘But they are still being created in the heart of the hottest, most energetic regions in the Universe, such as supernovae, gamma ray bursts, quasars and even stars like our Sun.’
- ‘Out beyond the galaxies, there are celestial objects called quasars, whose light has traveled at least 10 billion years to get here.’
- ‘Now, of course, I knew that most astronomers think a quasar is a black hole with matter falling into it from an accretion disk, and that for some reason it is ejecting charged particles along its magnetic poles.’
- ‘The fortuitous alignment of a quasar and a distant galaxy has enabled astronomers to unravel the origin and evolution of chemical elements’
- ‘Rich in objects, from galaxies to quasars to white dwarf stars, this vast data archive will serve as a resource for the entire astronomical community.’
- ‘Meanwhile, optical measurements suggest the quasar is a billion times more massive than our sun.’
- ‘Radio astronomers found pulsars, quasars, and massive molecular clouds dotting the celestial landscape.’
- ‘At those rates, each galaxy could easily have formed the quasar and its black hole power source in just a few hundred million years.’
- ‘However, the cosmic X-ray background, primarily made up of emissions from quasars, suggests that there must be many more of the voracious objects than could be accounted for by those currently known about.’
1960s: contraction of quasi-stellar.
We take a look at several popular, though confusing, punctuation marks.