Planet and Nature
It has become clear in recent years that planet Earth is only one planet among many others in the universe. Astronomy and Astrophysics have made an impressive progress within the last two decades. We have amazing insights into the extent of the universe in which billions of galaxies could be the home for countless planets. Planet Earth has become quite ordinary, even though we do not know if there is life on other planets beyond our own solar system. However, this should not lead us to give up the special relationship with our planet or the respect for nature that we humans owe our existence and everything else comes from. Let us therefore deal with planet Earth in a universe in which many planets exist, while not stopping to understand better what nature is and how we relate to it.