Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!watmath!clyde!floyd!vax135!houxz!houxm!ihnp4!zehntel!hplabs!sri-unix!cu-arpa.dietz@Cornell.ARPA From: cu-arpa.dietz@Cornell.ARPA Newsgroups: net.space Subject: Poynting Robertson Effect Message-ID: <1023@sri-arpa.UUCP> Date: Sun, 17-Jun-84 14:33:00 EDT Article-I.D.: sri-arpa.1023 Posted: Sun Jun 17 14:33:00 1984 Date-Received: Fri, 22-Jun-84 06:49:46 EDT Lines: 8 My explanation of the Poynting-Robertson effect was slightly wrong. The emission of radiation from the particle does not change its momentum; rather, more starlight hits the front of the particle than the back due to abberation. A similar phenomenom limits the maximum energy cosmic ray particles can have. If they travel too fast they lose energy by scattering off 3 K background photons (blue shifted to gamma rays).