
How many technological civilizations exist in the Milky Way? What the origin of life on Earth tell us about the parameters of the Drake equation.
The images shown in this gallery were created without a tracking device with a camera on a fixed tripod. The results were obtained by stacking up to 750 individual images. Images were taken with a Canon EOS 50D, Canon EOS 80D or a Panasonic Lumix FZ-200. Post-processing was done with Deep-Sky-Stacker, Pixinsight, Gimp or Photoshop.