Physics and Astronomy Online

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Physics & Astronomy Facts

So much going on in a grain of sand.
The Physics of Sandcastles

Give a plastic bucket and a shovel to a child, then turn her loose on a beach full of sand. She'll happily toil the day away building the sandcastle to end all sandcastles. It's pure fun. It's also se ...

Kinetic Theory of Gases

Air is a gas, and gases can be studied by considering the small scale action of individual molecules or by considering the large scale action of the gas as a whole. We can directly measure, or sense, ...

Powerful Quasars

Quasars appear as distant, highly luminous objects that look like stars. Strong evidence now exists that a quasar is produced by gas falling into a supermassive black hole in the center of a galaxy. Q ...

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