A-Level students from London will be the first in Europe to have their science experiments carried out in space.
Their experiments are onboard a shuttle due to launch today at 6.07pm (GMT). It will dock with the International Space Shuttle 220 miles orbiting 220 miles above Earth.
For the next 30 days astronauts will monitor and record the findings of the experiments and feed the results back to NASA.
One experiment is to see whether slime mould can grow three dimensionally in a zero gravity atmosphere. The other is to test whether anti-biotics can work in space.