© 2016 Phys.org (Phys.org)—In a new study, scientists have proposed that tiny residual effects measured by ether-drift experiments in the 1920s and ’30s may be the first evidence of a temperature gradient that was theorized in the 1970s, but never before detected in a laboratory. The theorized temperature gradient is thought to be caused by the solar system moving at 370 km/sec through the cosmic background radiation (CBR), which is the faint electromagnetic radiation that fills the universe. Citation: Could 80-year-old ether experiments have detected a cosmological temperature gradient? (2016, February 8) retrieved 18 August 2019 from https://phys.org/news/2016-02-year-old-ether-cosmological-temperature-gradient.html , Physical Review Letters This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.