... Structure and evolution of galaxies . The Magellanic Stream and high-velocity clouds . ... DINGO the ASKAP deep H i survey . ... In this scenario, small dark-matter haloes are expected to form first and later merge and accrete onto larger haloes to form more massive galaxies like the Milky Way. ... Our Milky Way is surrounded by a vast population of gas clouds, called high-velocity clouds (HVCs), that are mainly detectable in H i emission. ... Compact high-velocity clouds around the Milky Way . ...

metrologia The leap second: its history and possible future R. A. Nelson, D. D. McCarthy , S. Malys, J. Levine, B. Guinot, H. F. Fliegel , R. L. Beard and T. R. Bartholome w Abstract. This paper reviews the theoretica l motivatio n for the leap second in the context of the historica l evolutio n of time measurement . Th e periodic insertio n of a leap second step into th e scale of Coordinate d Universal Time (UTC) necessitates frequent changes in comple x timekeepin g systems an d is currentl y th e