PhysicSpace

THE POSTULATES      In 1905 Albert Einstein, a twenty-six-year-old technical expert third class at the Swiss patent office in Bern,...

THE ETHER      The Michelson-Morley experiment occupies a special niche in the pantheon of relativity. Contrary to many accounts, the...

EVENTS, OBSERVERS, AND FRAMES OF REFERENCE      We begin by defining some important terms. In relativity an event is any occurrence w...

RELATIVITY AND COMMON SENSE      A child walks along the floor of a moving train. Passengers on the train measure the child's spe...

THE UNIVERSE will certainly go on expanding for a while. As to its fate after that, the standard model gives an equivocal prophecy: It ...

So far our imagination carried us back to a temperature of 5,000 million million degrees, and we have had to deal with the strong, weak...

These rather intuitive ideas have recently been put on a much firmer mathematical foundation. In 1973 it was shown by three young theor...

Naturally, it is tempting to try to peek behind this veil. The temptation is particularly strong for theorists like myself, whose work ...

It does not seem to me to be historically very important to pinpoint the moment when the detection of a 3° K isotropic microwave backgr...