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-====== Astronomy ======
-Astronomy is the [[science]] that deals with everything in the universe outside the [[Earth]]. Before [[Galileo]] and [[Newton]], astronomy was all about measuring the angular positions of celestial objects thereby predicting and postdicting the location and time of interesting celestial events. To a lesser extent, ancient astronomers including [[Ptolemy]] and [[Copernicus]] also devised grand theories of the whole universe giving birth to the field of [[cosmology]]. Since the invention of the [[telescope]], things have completely changed and astronomy has turned into a 'physical' science from a purely 'mathematical' science. The objects modern astronomers study include [[planets]] and [[planetary systems]], [[stars]] and [[interstellar mediums]], [[galaxy|galaxies]] and [[intergalactic mediums]], [[galaxy clusters]], the [[cosmic web]], and the [[universe]] as a whole. Since the twentieth century astronomers can also study the Earth from space using spacecrafts and probes, but the Earth is more appropriately the object of the [[Earth sciences]].