An astronomical observatory is a location used for observing events that happen in space. Whilst an observatory can consist of just one telescope, some of the better locations in the world can have more than twenty telescopes.
Observatories are used to make observations in the radio, infrared and visible light (optical) regions of the electromagnetic spectrum. Most telescopes are put into domes to protect their instruments from poor weather. However, the domes can rotate, and have an opening in the roof that can be used during observing, and closed when the telescope is not in use.
The location of an observatory is chosen to give the best chance of obtaining clear images of the objects being observed. To achieve this, astronomers try to meet three main requirements for any observatory, namely that it's: