What types of galaxies are there and how can we distinguish them? A visit to the galaxy zoo.
The view of the starry sky changes in the course of a night. Why? What shape have the paths on which the stars are moving? And how is this motion related to the change of day and night?
How to detect asteroids? How can their orbits be determined? Is there a danger of an impact on the earth?
Constellations have always fascinated people. They give us orientation and help us to find planets, galaxies and other objects in the sky.