The ANU College of Physical & Mathematical Sciences comprises the Research Schools of Astronomy & Astrophysics, Chemistry, Earth Sciences, Mathematical Sciences and Physics. Under the direction of Mark Oliphant, nuclear physics was one the university's most notable early research priorities, leading to the construction of a 500 megajoule homopolar generator and a 7.7 megaelectronvolts cyclotron in the 1950s. These devices were to be used as part of a 10.6 gigaelectronvolt synchrotron particle accelerator that was never completed, however they remained in use for other research purposes. ANU has been home to eight particle accelerators over the years and operates the 14UD and LINAS accelerators. Brian Schmidt (astrophysicist at Mount Stromlo Observatory) received the 2011 Nobel Prize for Physics for his work on the accelerating expansion of the universe.