Claus Iversen is interested in amateur astronomy, although the Danish skies are not the most ideal in terms of clear nights.

With years of dedication to the sky, books on astronomy and science fill the bookshelves a lot.

During the years 2014 - 2018, Claus Iversen gave lectures on astronomy at evening schools. He also holds lectures to the greater public. The contents of the lecures can vary greatly. Historical contexts in astronomy, over contemporary knowledge of  astronomy, pioneering theories in cosmology and the evolution of the universe.