[Tuesday, September 2, 2008] Challenger Center for Space Science Education's Board of Directors welcomed a new member to its ranks: Dr. S. Alan Stern.

[Friday, September 12, 2008] The first major order of business in New Horizons' second annual checkout was accomplished as planned, as operators uploaded an upgraded version of the software that runs the spacecraft's Command and Data Handling system.

[Saturday, September 20, 2008] The demotion of Pluto sparked considerable public controversy. Numerous planetary scientists and astronomers protested the IAU's definition as not useful, while numerous other planetary scientists and astronomers supported the outcome.