The MIT Haystack observatory is about an hour outside of Boston. The dish antenna inside the radome (a golf ball like structure but it only repeats about 3 times) measures 37 meters in diameter (over 100 feet). Scientists operate the giant antenna (dish) in the building under the radome. Many experients take place here, for example: "one of the more impressive ideas presented by the speakers involved masers, which glow inside large molecular clouds. Their use is a very clever way to map movement of the gases in distant nebula and galaxies."