Further down on this page you can locate the different categories on our site. You can also find the latest additions the links further down on this page.
|Iceland on film: a road trip around the 'Hollywood of the north'|
|Venezuela divisions deepen as protest over food shortages is halted|
|Malaysia Airlines: four passengers' identities under investigation|
|25 things you might not know about the web|
|Jeremy Hunt's 'hospital closure' clause prompts cross-party revolt|
|Sara Cox: 'Now you can see me on the radio. It's freaky!|
|Duwayne Brooks: Met still prejudiced – but not only against black people|
|Bayern Munich's Uli Hoeness in court over secret Swiss account|
|Welsh town comes together to save 'Lonely Tree'|
|Sex abuse investigations target top state schools|
|Call to stop 'bad example' of alcohol at primary school events|
|Bring forward high-speed rail link or face spiralling costs, says HS2 boss|
|New Co-op storm as board awards bosses huge pay and bonus deals|
|Obama confers with key European allies over Russian action in Crimea|
|Northern Lib Dems rebel over cuts|
|Many 'self-employed' women get by on less than £10,000 a year|
|Hunger strike by 750 immigrants at Washington state detention centre|
|Scotland Yard in new undercover police row|
Astronomy is one of the oldest sciences. Prehistoric cultures left behind astronomical artifacts such as the Egyptian monuments, Nubian monuments and Stonehenge, and early civilizations such as the Babylonians, Greeks, Chinese, Indians, Iranians and Maya performed methodical observations of the night sky.
However, the invention of the telescope was required before astronomy was able to develop into a modern science. Historically, astronomy has included disciplines as diverse as astrometry, celestial navigation, observational astronomy, the making of calendars, and astrology, but professional astronomy is nowadays often considered to be synonymous with astrophysics. During the 20th century, the field of professional astronomy split into observational and theoretical branches.
Observational astronomy is focused on acquiring data from observations of celestial objects, which is then analyzed using basic principles of physics. Theoretical astronomy is oriented towards the development of computer or analytical models to describe astronomical objects and phenomena. The two fields complement each other, with theoretical astronomy seeking to explain the observational results, and observations being used to confirm theoretical results.