Is Sedna a new planet?
Astronomers can see a very big object in space. Its name is Sedna and it has not been seen before. It is circling the Sun, but is a very long way from it. Sedna is a similar size to Pluto, our furthest known planet until now, but it is also very far from Pluto and is very difficult to see. Astronomers are very excited about this discovery and think it could be a newly found planet. Perhaps it is the tenth planet in our solar system; but so far the astronomers cannot be sure that it is a real planet. They are now using the Hubble space telescope to study Sedna, and they are taking photographs. They know that Sedna has no moon. Some astronomers say that it is not a planet, but only a big piece of rock and ice. Soon we should know a lot more about this new discovery.
