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.
Salamanders are amphibians that look like a cross between a frog and a lizard. Their bodies are long and slender; their skin is moist and usually smooth; and they have long tails. Salamanders are very diverse; some have four legs; some have two. Also, some have lungs, some have gills, and some have neither â they breathe through their skin. Salamanders belong to the order Caudata, one of three orders in the Amphibia class, along with Anura (frog and toads) and Gymnophiona (caecilians, which have no legs and resemble large worms).