NASA continues to troubleshoot the cause of a failure of an auxiliary power unit (APU) heater that scrubbed Endeavour’s April 29th launch. 

NASA’s Kennedy Space Center tweeted that the earliest launch date is May 10th, but the date could slip later as troubleshooting and testing continues.

Endeavour’s 14-day mission is to transport the Alpha Magnetic Spectrometer (AMS) and spare parts to the International Space Station, including two S-band communications antennas, a high-pressure gas tank, and additional spare parts for Dextre. This will be the 36th mission to the International Space Station for the shuttle program. Endeavour’s crew includes Commander Mark Kelly, Pilot Gregory H. Johnson, and Mission Specialists Michael Fincke, Greg Chamitoff, Andrew Feustel, and European Space Agency astronaut Roberto Vittori.

Read about the $2 billion Alpha Magnetic Spectrometer here and check out this video below: