Chad Trujillo and David Rabinowitz, with the San Diego telescope, discover the small planet Sedna; within a few weeks, observational confirmations arrive from telescopes in Chile, Hawaii and the Spitzer Space Telescope; Sedna is slightly smaller than Pluto, with a highly elliptical orbit that brings it 13 billion km from the Sun at perigee (which will be in about 20 years) and 130 billion km from the Sun at apogee: it is probably one of the innermost representatives of the Oort Cloud, which should be located 1.5 million km from the Sun.
