One of the more productive telescopes in space is the tiny Canadian MOST satellite (Microvariability and Oscillations of Stars). Developed and maintained on a shoestring - $7 million USD - MOST is only the size of a suitcase, but it has a very sensitive instrument which can detect the variations in star brightness. MOST has been used to analyze recently discovered extrasolar planets as they pass in front of their parent stars, and even get some information about their atmospheres.