Nuclear physics is the study of the protons and neutrons at the centre of an atom and the interactions that hold them together in a space just a few femtometres (10-15 metres) across. Example nuclear ...

Optical physics is the study of the fundamental properties of light and its interaction with matter. This includes classical optical phenomena such as reflection, refraction, diffraction and ...

The Center for Astrophysics and Space Astronomy (CASA) is dedicated to advancing our understanding of the Universe in which we live through observations, theory, and the development of ground-based ...

The idea of the atom as the building block of matter has developed over time. What was thought of as a single particle about 1 × 10‾¹⁰ m across is now known to be a collection of smaller particles.

An object in a fluid is displacing some of the fluid. The upthrust force is equal in size to the weight of the fluid displaced by the object. If the upthrust is less than the weight of the object, the ...

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June 3, 2026 • The White House Office of Management and Budget is moving to take more control of billions of dollars in federal grants. Critics say the proposed change would jeopardize the integrity ...