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.
A kasbah, also known as qasaba, gasaba, and quasabeh, or in older English casbah, or qasbah and qassabah in India, is a type of medina, or fortress. The word kasbah comes from the Arabic Ø§ÙÙØµØ¨Ø©, meaning central part of a town or citadel.