Einstein and Gravity

26 Sep 2010

At http://calderup.wordpress.com Sept 24th ... there is a post on General Relativity and Einstein which is a favourite theme of Nigel Calder. In the current issue of Science magazine James Chin-Wen Chou et al detected the well known effects of relativity on the rate of time passing  and at the scale of ordinary human activities. Chou's team used laser light in a pair of aluminium-27 optical clocks to show that time can pass more slowly via the effect of motion on time. In another experiment they lifted one clock slightly higher than another, just 33cm. The clock that was higher ran faster because it was further from the earth's field of gravity (and the gravitational field was slightly weaker).