The Origin of the Universe

How did the universe begin about 12 billion years ago? The question concerns the very large—space, galaxies, etc.—but also the very small, namely the innermost structure of matter. The reason is that the early universe was very hot, so that matter was then decomposed into its constituents. These two topics …

Reagan’s Star Wars

Following are excerpts from the report just issued by the Union of Concerned Scientists on “Space-Based Missile Defense”—often referred to as “Star Wars.” The report is of urgent interest in view of the announced plans of the Reagan administration to develop a spacebased missile defense during the coming years. The …

On Niels Bohr

Niels Bohr: The Man, His Science, and the World They Changed

by Ruth Moore

The Questioners: Physicists and the Quantum Theory

by Barbara Lovett Cline
One achievement that stands apart, in the complex history of ideas of the twentieth century, is the development of our concept of the structure of matter. It was a steady development, which penetrated deeper and deeper into the inner structure of the atom, ever broadening with each step our understanding …