1. Spiral structure and star formation Creator: Elmegreen, Bruce G. Format: bez média and svazek Type: model:article and TEXT Subject: space research, spiral structures, and star formations Language: Czech Description: The formation of giant regions of star formation by gravitational instabilities in spiral arms ard discussed, The importance of the spiral arms strength for triggering new star formation is emphasized. Rights: http://creativecommons.org/publicdomain/mark/1.0/ and policy:public