2014 NASA-ESA-HST advent calendar, created from images published on .
Tour the Universe Slideshow
Turn speakers on. Suggested viewing – Sit back and relax. Slides change automatically every 8 seconds. If you click forward, sound track is off timing.
The brightness profiles of the spiral galaxies Tsvetan B. Georgiev, Institute of Astronomy and Rozhen NAO 3.9.2008, Sozopol (In collaboration with O.Stanchev,
