"We live in a golden age of cosmology," says Jeremy Butterfield, a philosopher of physics from the University of Cambridge. Since the mid 20th century, we’ve seen dramatic advances in our understanding of the Universe. It started with Einstein’s development of the general theory of relativity in the beginning of the century, which provided a deeper understanding of the structure of stars and galaxies and their formation. In the 1960s the unprecedented precision of observations provided an enormous stimulus. This, according to Butterfield, therefore also heralds a golden age for philosophy.