Determining Orbits is a real gem. This comes from an original Mystus concept. We wanted to give the visitor the experience of doing science; making observations, and analyzing them. The subject here is astronomy. Visitors find the 'hot spot on the room with their receiver and take measurements. With a very cool monitor based interface they push play with the seemingly random and unrelated observations to discover, much to their surprise, a beautiful sinusoidal curve popping out all of a sudden. They discover that this is the period of the rotating system they had found and can walk over to the rotating transmitter to see if they were right. Mystus developed an ultrasonic transmitter for this exhibit that works up to 200 ft. Sorry no more details on how we did it. That's a secret. A great exhibit for talking about the process of science. So that's what astronomers are doing with their telescopes.