physics
Figure 1.1 Galaxies are as immense as atoms are small. Yet the same laws of physics describe both, and all the rest of naturean indication of the underlying unity in the universe. The laws of physics are surprisingly few in number, implying an underlying simplicity to natures apparent complexity. credit: NASA, JPL-Caltech, P. Barmby, Harvard-Smithsonian Center for Astrophysics .