X-Ray observations of an extrasolar planetary system
Friday, October 22, 2010 - 14:01
in Astronomy & Space
(PhysOrg.com) -- The majority of extra-solar planets (about 278 of them) are more massive than Jupiter. About 20% of this majority group orbit their stars at a distances of less than one-tenth of an astronomical unit (one AU is the average distance of the Earth from the sun, and in our solar system Mercury is four-tenths of an AU from the sun).