Timeline for Particle Collider in Doubt (Update)

This picture provided by the European Organization for Nuclear Research (CERN) shows a large dipole magnet symbolically lowered into the tunnel in Geneva, to mark the end of a crucial phase of installation of the Large Hadron Collider (LHC), 26 April 2007. This completes the basic installation of the more than 1700 magnets that make up the collider, which measures 27 km in circumference and is scheduled to be commissioned at the end of 2007.

(AP) -- The world's most ambitious particle collider - which scientists hope could reveal what matter is made of - might not be fully functional until next year, months after its scheduled startup date, officials at the European Organization for Nuclear Research said Thursday.