Inspired by recent work on feedback in disk galaxies (Efstathiou 2000; Silk 2003) and on the angular momentum distribution in simulated gas halos (Sharma & Steinmetz 2005), a fully dynamic model of disk galaxy formation and evolution has been developed. This is used to demonstrate how observed galactic systems could have formed from halos similar

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At the Museum of the Science and the Cosmos (MCC, La Laguna, Tenerife) there is a small planetarium. All the different planetarium shows are carried out entirely by the Museum staff, from the original idea and the script to the final production. In February 2007, Meteorite, a rock from space, a new show, specifically for children, was released. The

Measuring the surface brightness changes in HST images in Hα and [O III]5007 Å taken with a time interval of 6.84 yr, we show how to detect separately the changes due to density variations and those due to temperature variations. Following O'Dell et al., we used the brightness changes to show and measure proper motions in streams and fronts at up