Did you know July 4th is the Martian Solstice?
Or that on July 7th the Dawn probe will launch with a mission to study the minor planets Ceres and Vesta in the asteroid belt (arrival 2011)?
These are just a couple of the interesting facts on NASA's Solar System Exploration site. Here's the link: http://solarsystem.nasa.gov/news/index.cfm
It will also be added to our permanent list of reference sites on the lower right.