Astronomy is a fascinating subject. Discoveries are made daily. The book you buy today on astronomy will quite possibly be out-of-date tomorrow.
This site will highlight some of the recent discoveries.
Astronomers have discovered stars that are as cool as 80 degrees Fahrenheit. The Y Dwarfs have been theorized for about a decade. The WISE mission has found them.
For details see NASA's WISE Mission Discovers Coolest Class of Stars
NASA's Dawn spacecraft obtained this image if Vesta with its framing camera on July 17, 2011. It was taken from a distance of about 9,500 miles (15,000 kilometers) away from the protoplanet Vesta. Each pixel in the image corresponds to roughly 0.88 miles (1.4 kilometers). Credit: NASA/JPL-Caltech/UCLA/MPS/DLR/IDA
Full frame pictures obtained on 24 July 2011
A"Big Splat"may be the reason why the far side of the moon is so much more rough than the near side. In short, the far side may be the result of a collision with a smaller moon.