Major Timothy Peake has sent his final tweet before starting his 6-month mission aboard the International Space Station.
The British astronaut will blast off today at 11:03am (GMT) from the Baikonur Cosmodrome in Kazakhstan and the Soyuz rocket has already arrived at its launch site, dubbed Site No 1.
Major Peake was selected in 2009 to become the first UK astronaut to work on the ISS. Selected out of 8,000 candidates he then underwent a series of gruelling tests and challenges in order to make sure he was ready for the long-haul mission aboard the space station.
The Briton will have his hands full for the duration as not only will he have to carry out a range of experiments on behalf of scientists on the ground but he'll also have to take almost perfect care of himself as researchers analyse his food intake.