A flock of birds takes flight while the Rotating Service Structure inches away from the space shuttle Endeavour at Kennedy Space Center in Cape Canaveral. (By Thom Baur/Associated Press)

Endeavour’s launch has been scrubbed for at least 48 hours because of an issue with Auxiliary Power Unit 1 heaters.less than a minute ago via web Favorite Retweet ReplyNASA

Update II: The launch has been moved to Monday at 2:33 p.m., NASA reports.

The final preparations are underway for the launch of space shuttle Endeavor. NASA reports that all systems are currently a go for the mission, the second to last in NASA’s space shuttle program.

Not only is it a historic flight, heralding the end of the program, but at Endeavor’s command is Mark Kelly, husband to Rep. Gabrielle Giffords. She will be there to watch the launch, along with the first family, and 116 other VIP guests from around the world, one of the largest invite lists for a NASA launch. Thirty-eight members of Congress will also attend, and 700,000 spectators are expected to show up in Cape Canaveral to watch the launch.

The shuttle will be transporting “a $2 billion, seven-ton cosmic experiment about 17 years in the making,” writes The Post’s Brian Vastag. The Antimatter hunter “will sniff space for cosmic rays, antimatter, dark matter and other exotic and poorly understood phenomena.”

Watch video of the “space coast” as it prepares for the end of the shuttle program: