19. Which would be the best title for this passage? The astronomers that discovered a new body in our solar system have found out more about the planetoid. Sedna is between 800 and 1,100 miles in diameter. It is about three-quarters the size of Pluto and is over 8 billion miles from Earth. The frozen world of Sedna is believed to be the farthest known object within our solar system. Astronomer Mike Brown from the California Institute of Technology led the NASA-funded team that found Sedna. Chad Trujillo of the Gemini Observatory in Hawaii and David Rabinowitz of Yale University also assisted in the discovery. They found Sedna using a 48-inch telescope at Caltech's Palomar Observatory, which is east of San Diego. Within days of the discovery, other astronomers used telescopes to find the object. The team also believes that a tiny moon may trail Sedna. Brown's team learned that Sedna is over three times farther away from the Sun than Pluto. The planetoid was named for the Inuit goddess who created the sea creatures of the Arctic. Sedna was discovered in November 2003. The Sun would be so small from Sedna that it could be completely blocked out with a pinhead. The planetoid is the largest object found orbiting the Sun since the discovery of Pluto in 1930. It is much larger than Quaoar, which was found by the same team in 2002.

a. Ninth Planet Pluto Trailed by a Moon
b. Sedna Returns to Earth with New Data
c. Astronomers Learn More about Sedna
d. A Moon May Trail Sedna, Astronomers Say