Moon rocket heads for repairs

Grounded until at least April, NASA’s giant moon rocket is headed back to the hangar this week for more repairs before astronauts climb aboard.The space agency said  it’s targeting Tuesday for the slow, four-mile (6.4-kilometre) trek across Kennedy Space Center, weather permitting. NASA had barely finished a repeat fuelling test Thursday, to ensure dangerous hydrogen fuel leaks were plugged, when another problem cropped up.

This time, the rocket’s helium system malfunctioned, further delaying astronauts’ first trip to the moon in more than half a century. Engineers had just tamed the hydrogen leaks and settled on a March 6 launch date — already a month late — when the helium issue arose. The helium flow to the rocket’s upper stage was disrupted; helium is needed to purge the engines and pressurise the fuel tanks.