In 2004, the media again talked about the subject, when Sedna was discovered, twice as far from the sun than Pluto. Sedna is not a planet. In 2005, the discovery of Eris was announced. This was called a planet at first; but later reclassified. Today it is the biggest of the dwarf planets. Many other objects were discovered, but none of these is made of solid rock, they more resemble asteroids and comets.