Podcast: Einstein’s Theory of General Relativity

If you remember way back to Episode 9, we covered Einstein’s Theory of Special Relativity. Well, that’s only half of the relativity picture. The great scientist made an even more profound impact on physics with his theory of general relativity, replacing Newton with a better model for gravity. Click here to download the episode Einstein’s …

The World is Not Enough: A New Theory of Parallel Universes is Proposed

Imagine if you were told that the world is simple and exactly as it seems, but that there is an infinite number of worlds just like ours. They share the same space and time, and interact with each other. These worlds behave as Newton first envisioned, except that the slightest interactions of the infinite number create …

Einstein Right Again! Rapidly Spinning Pulsar Follows General Relativity

A unique and exotic laboratory about 6,800 light-years from Earth is helping Earth-based astronomers test Albert Einstein’s theory of general relativity in ways not possible until now. And the observations exactly match predictions from general relativity, say scientists in a paper to be published in the April 26 issue of the journal Science. Using ESO’s …

Gravity Probe B Confirms Two of Einstein’s Space-Time Theories

[/caption] Researchers have confirmed two predictions of Albert Einstein’s general theory of relativity, concluding one of NASA’s longest-running projects. The Gravity Probe B experiment used four ultra-precise gyroscopes housed in an Earth-orbiting satellite to measure two aspects of Einstein’s theory about gravity. The first is the geodetic effect, or the warping of space and time …

Astronomy Without A Telescope – Doubly Special Relativity

[/caption] General relativity, Einstein’s theory of gravity, gives us a useful basis for mathematically modeling the large scale universe – while quantum theory gives us a useful basis for modeling sub-atomic particle physics and the likely small-scale, high-energy-density physics of the early universe – nanoseconds after the Big Bang – which general relativity just models …

This is Getting Boring: General Relativity Passes Yet another Big Test!

[/caption] Published in 1915, Einstein’s theory of general relativity (GR) passed its first big test just a few years later, when the predicted gravitational deflection of light passing near the Sun was observed during the 1919 solar eclipse. In 1960, GR passed its first big test in a lab, here on Earth; the Pound-Rebka experiment. …

Einstein’s General Relativity Tested Again, Much More Stringently

[/caption] This time it was the gravitational redshift part of General Relativity; and the stringency? An astonishing better-than-one-part-in-100-million! How did Steven Chu (US Secretary of Energy, though this work was done while he was at the University of California Berkeley), Holger Müler (Berkeley), and Achim Peters (Humboldt University in Berlin) beat the previous best gravitational …