They analyze large quantities of data and write scientific papers on their findings. Most astronomers spend only a few weeks each year making observations with telescopes, radio telescopes, and other instruments. Contrary to the popular image, astronomers almost never make observations by looking through a telescope because photographic and electronic radiation detecting equipment is more effective than the human eye. However, since all physics involves the same fundamental principles, specialties may overlap, and physicists may switch from one subfield to another. Growing numbers of physicists work in combined fields such as biophysics, chemical physics, and geophysics.
Physicists generally work regular hours in laboratories and offices.
Most physicists do not encounter unusual hazards in their work. Employment Physicists held over 20,000 jobs in 1990. In addition, about 16,000 persons held physics faculty positions in colleges and universities. About one-third of all physicists worked for independent research and development laboratories. The Federal Government, mostly the Departments of Defense, Energy, and Commerce, employed about one-fifth.