September 25, 2010 |
Among the oft-repeated predictions of Albert Einstein's famous theory of relativity is that if a twin travels through the cosmos on a high-speed rocket, when he returns to Earth he will be noticeably younger than the twin who stayed home. Now physicists have demonstrated that the same is true even if the traveling twin is merely driving in a car about 20 mph. But in that case, when the twin gets home from the grocery store, he is only a tiny fraction of a nanosecond younger, according to a report in Friday's edition of the journal Science.
June 14, 1988 |
The Pioneer 10 spacecraft, now farther away from Earth than any other device built by humans, will be asked to prove part of Einstein's theory of relativity later this year. If it does so, it will have succeeded where scores of scientists have failed.
February 24, 2004 |
In 1962, Francis Everitt, a restless young physics researcher from England, signed up at Stanford University for what he thought would be a "few years of entertaining work" on a space project. The goal was to put a satellite in orbit 400 miles above Earth to validate or disprove, once and for all, Albert Einstein's general theory of relativity. Four decades and $700 million later, Everitt is still working on Gravity Probe B.
October 19, 1993 |
Albert Einstein was one of the great minds of all time, but even he didn't know if his General Theory of Relativity was correct. But now Stanford University researchers hope to find out, or at least come reasonably close. Last week they took a big step in the university's quest when they doled out a $100-million subcontract to Lockheed Corp. to build a spacecraft for what they say could be "one of the great physics experiments of the 20th Century."
October 6, 2012 |
Squinting into the dark heart of the Milky Way, astronomers have discovered a star that orbits closer to the supermassive black hole at the center of the galaxy than any other star yet observed. The relatively dim star, known as S0-102, is so close that it takes just 11.5 years to circle the black hole at speeds as high as 5,000 kilometers per second - or 1.7% as fast as the speed of light. The previous record-holder, S0-2, took 16 years to make its way around. A black hole is a star whose mass has collapsed to a point called a singularity.
December 28, 2004
Regarding "Bitter Truths" [Dec. 21]: An indoors California girl allergic to nearly every animal, tree, blossom and blade of grass on Earth, having seen snow fall only three times in my life (the second time being in January 1962, the day Richard Nixon, campaigning for governor, paraded down Foothill Boulevard), I want to tell you how much I enjoyed the essays describing vividly frigid sea, winter sky and relativity of cold. Brrrr. Joan Jobe Smith Long Beach