Tranquility will undergo an emergency reboot, Friday, July 2 (http://www.eveonline.com/news.asp?a=single&nid=3976&tid=1)
2 July 2010, 3:52 pm
Tranquility will be taken offline for an emergency reboot in order to fix an issue which has been discovered with Planetary Interaction. The downtime will begin at 14:40 UTC and we expect Tranquility to be back online at 14:55 UTC.
Source: eve-online.com | news from EvE (http://www.eveonline.com/)