Astronomie
Blidquellen – Astronomie
HUBBLE TELESCOPE
NASA
NASA-Seite
http://www.nasa.gov
GRINS (Great Images In Nasa)
http://grin.hq.nasa.gov
APOD (ASTRONOMIC PICTURE OF THE DAY)
APOD-Lizenzbestimmungen
http://www.starobserver.org/banner.html
Bilder von Privatpersonen
TONY AND DAPHNE HALLAS
http://astrophoto.com
Jesús Vargas
http://www.sky-astrophotography.com