Chris Cassidy and his fellow crew are going to be earth-bound for about another month.

The shuttle, with its seven-man crew on board, was scheduled to launch at 5:40 am EDT Wednesday. However, a gaseous hydrogen leak was detected at the shuttle’s Ground Umbilical Carrier Plate, located in the same area that led to the cancellation of the original launch scheduled on June 13. The launch was aborted at 1:55 am.

According to Deputy Space Shuttle Program Manager LeRoy Cain, they have decided to take a step back to find what the problem is, then fix it. Only after the root problem is identified and they have arrived at a solution that is going to work and allow the team to fly safely will the launch move forward. In order to give NASA engineers enough time to perform a thorough root cause analysis as well as identify a fix that will permanently resolve the issues, the launch has been moved to July.

As for Chris Cassidy and the Endeavour crew, they will reportedly be reverting back into a mission training schedule starting on Monday.

The mission of Chris Cassidy and the Endeavour crew is being called one of NASA’s most technical missions yet. The main objective of the 16-day mission is to expand the Japanese laboratory on the International Space Station. The highly complex operation entails the use of three separate robotic arms – two that will work together and one that will “walk” across the exterior of the space station – and five space walks.

NASA will, however, proceed with the launch of two lunar satellites – the Lunar Reconnaissance Orbiter and the Lunar Crater Observation and Sensing Satellite. Both are scheduled to be launched aboard an Atlas V rocket between 5:00 and 5:32 PM. Both satellites will be sending information that will be used by NASA scientists in determining safe landing sites and resources for man’s return to the moon.