Voorbeelden van quasar

• Astronomical objects of all scales ranging from supermassive stars via galaxy nuclei and quasars to the universe as a whole are described on its basis.

• This reference frame is based on observations of satellites and celestial radio sources known as quasars made from various co-ordinated stations around the globe.

• A binary quasar, may be closely linked gravitationally and form a pair of interacting galaxies.

• From counting dead quasars, he deduced that most massive galaxies have black holes at their centres.

• It comprises seventy-three quasars, with a minimum diameter of 1.4 billion light-years, but over four billion light-years at its widest point.

• The result is a rare example of a sixfold multiply imaged quasar.

• Quasars are the furthest active galaxies, some of them being observed at distances 12 billion light years away.

• It has been called the naked quasar and the quasar without a home because it appears to lack a host galaxy.

• Such information as there is about the host galaxies of radio-loud quasars and blazars suggests that they are also hosted by elliptical galaxies.

• This early burst of star formation is thought to have made a protogalaxy's luminosity comparable to a present day starburst galaxy or a quasar.

• This pair provide evidence for the theory that quasars are switched on by galactic collisions.

• Gravitational lensing was first observed in 1979, in the form of a quasar lensed by a foreground galaxy.

• This would mean that a quasar varying on a time scale of a few weeks can not be larger than a few light-weeks across.

• Quasars show the locations where massive black holes are growing rapidly (via accretion).

• There were also serious concerns regarding the idea of cosmologically distant quasars.