Magellanic Clouds
In Australia in late 1951, Kerr used a specially built 36-foot transit telescope, the largest dish of its kind in Australia, and started mapping the Magellanic Clouds, discovering considerable amounts of neutral hydrogen and an extended envelope around both clouds. From 1954 to 1955, Kerr was a member of the team that determined the rotation of the Magellanic Clouds and their masses. Kerr coined the term "galactic warp" to refer to the distorting effect of the Magellanic Clouds' gravity on the shape of our own galaxy.