Abell 39 is a planetary nebula with low surface brightness in the constellation Hercules. It shines predominantly in the blue light of the double ionized atomic oxygen [OIII]. It is assumed that the nebula is about 6800...
American scientists point to a problematic development in observational astronomy. Large telescopes have enabled novel research activities that were previously unthinkable, including the provision of large datasets. As...
Frau Brigitte Thome-Bode from Hannover donated the complete observatory of Hans-Joachim Bode to the STScI. The first-class ensemble of several lens and reflector telescopes, a very heavy mount (we now know how the...
The Dumbbell Nebula M 27 is an extraordinarily large planetary nebula, not only because it is not even 1,000 light years close to us, but also because it has a considerable real extension of about 2.5 light years...
