Cape Canaveral - Nasa on Monday delayed the launch of space shuttle Endeavour to April 29 from April 19 because of a scheduling conflict at the International Space Station.
Endeavour's mission will be the second-to-last for Nasa’s shuttle program and will deliver a $2 billion particle detector called the Alpha Magnetic Spectrometer to the orbital outpost.
Nasa pushed back the launch date to avoid having Endeavour's mission overlap with the arrival of a Russian cargo ship at the station - a $100 billion project of 16 nations which orbits about 220 miles (354km) above Earth.
Nasa officials had hoped the unmanned Progress, which is carrying cargo and science experiments, could loiter in orbit until Endeavour's scheduled May 1 departure from the space station.
But the Progress is carrying a biological experiment that cannot linger in orbit, Nasa spokesman Allard Beutel said.