New technology resulting in improvements in analytical techniques and instruments, such as computers and optical telescopes and mounts, is leading to a resurgence in ground-based research. A small number of astronomers work in museums housing planetariums. These astronomers develop and revise the programs presented to the public, and may also direct operations. However, all physics involves the same fundamental principles, so specialties may overlap, and physicists may switch from one subfield to another. Also, growing numbers of physicists work in combined fields such as biophysics, chemical physics, and geophysics.
Physicists often work regular hours in laboratories and offices.
At times, however, those who are deeply involved in research may work long or irregular hours. Most do not encounter unusual hazards in their work. Some physicists temporarily work away from home at national or international facilities with unique equipment such as particle accelerators. Long hours, including routine night work, may create temporarily stressful conditions. Physicists and astronomers whose work is dependent on grant money are often under pressure to write grant proposals to keep their work funded.