How many weeks' holiday a year are there?
order glyburide Launched in 2004, Rosetta has already spent almost 10 years in space preparing for its big day. The probe had to conduct three fly-bys of Earth and one of Mars, taking advantage of the planets' gravity to accelerate sufficiently to intercept comet 67P as it orbits the sun at speeds of up to 100,000 kilometres per hour.