Globular clusters are spherical collections of mostly ancient stars numbering between tens of thousands to a million or more stars stretching 100 to 300 light years across. They are truly ancient structures with a minimum age of about 11 billion years. Most are believed to have formed at the same time as their parent galaxy. To date there are over 160 globular clusters discovered in our Milky Way.
[description from Rob Gendler’s primer]
Hello, my name is Martin Rusterholz. I’m a Swiss amateur astrophotographer living near Zurich, the biggest town in Switzerland. My interest in astronomy started when I was 16. At that time, I built my first Newtonian telescope and mount. I studied physics at the Swiss Federal Institute of Technology (ETH) which was the only study including at least some aspects of astronomy and astrophysics.
“Looking at the nights sky is an experience touching everybody deeply inside, something common to all human beings independent to the language spoken by the individuals”.
Deep-sky astrophotography is my passion. 
