Cistus, with its many hybrids and cultivars, is commonly encountered as a garden flower. The common name rockrose is applied to the species, a name also shared by the related genera Halimium, Helianthemum and Tuberaria, all in the family Cistaceae. The common name gum cistus is applied to resin-bearing species, especially C. ladanifer.
Quasars are part of a class of objects known as active galactic nuclei (AGN). Other classes include Seyfert galaxies and blazars. All three require supermassive black holes to power them.
The redshift of the quasar 3C 273 shows that the object is 1.5 billion light-years (a light-year is the distance that light travels in a yearâ9.5 trillion km, or 5.9 trillion mi) from Earth.Schmidt determined that the quasar was much too distant to be part of the Milky Way Galaxy.est Answer: Quasar, astronomical object that is very bright for its size and distance from Earth. Another important identifying feature of quasars is a shift in the light emitted by quasars that indicates they are moving away from Earth very quickly.