Major purpose of this lecture is to present on Space Infrared Telescope Facility: Herschel Experiment. Space Infrared Telescope Facility exploring the universe in the infrared. Planned launch: December 2002 and expected lifetime: 5 years. Objective of Herschel Experiment: To perform a version of the experiment of 1800, in which a form of radiation other than visible light was discovered by the famous astronomer Sir Frederick William Herschel.