On its 25th and final flight, space shuttle Endeavour's six-man crew will deliver a $2b science experiment to the international space station.
Scientists hope the experiment, called the Alpha Magnetic Spectrometer and planned for more than a decade, will shed light on the mysteries of 'anti-matter' - and possibly pave the way for humans to travel deeper into space than ever before.
Trent Martin, the project's manager, told Al Jazeera: "Essentially, what we're trying to do is to map the cosmic rays that are coming and hitting the earth so that we can tell what's out there, what's in the universe."
Al Jazeera's Scott Heidler reports from NASA's Kennedy Space Centre in Florida.
Source: Al Jazeera