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ESA astronaut Alexander Gerst performs a demonstration of how ESA's Rosetta mission will attempt to put a lander, called 'Philae' on the surface of comet 67P/Churyumov-Gerasimenko.

Alexander narrates the story of the Rosetta mission and performs a demonstration that visualises the difficulties of landing on an object that has little gravitational pull. Using the weightless environment of the Space Station, Alexander attempts to land 'Philae' (an ear plug) onto the surface of the 'comet' (an inactive SPHERES robot) with increasing levels of difficulty: a rotating comet that is not moving to one that is both rotating and moving.

This video is one of the six experiments and demonstrations in the Flying Classroom, Alexander will use small items to demonstrate several principles of physics in microgravity to students aged 10-17 years.

The Rosetta mission's lander, Philae, will be deployed on 12 November at 08:35 GMT/09:35 CET from a distance of 22.5 km from the centre of the comet. It will land about seven hours later, with confirmation expected to arrive at Earth at around 16:00 GMT/17:00 CET.

The Philae lander has attempted to drill into the surface of comet 67/P, amid fears that its battery may die in hours.

Researchers at Esa say the instrument is being deployed to its maximum extent despite the risk of toppling the lander.

Scientists hope they will also be able to capture some samples for analysis in the robot's onboard laboratories.

If the battery dies the results may not make it back to Earth.

Final preparations are under way for what could be one of the most ambitious feats in space exploration.
On Wednesday, the European Space Agency will try to land a tiny spacecraft on a comet. This has never been attempted before.
The comet is about 300 million miles away (500 million km), far beyond Mars and is racing through space at about 34,000 mph (55,000 km/h).
Esa's Rosetta satellite has flown for 10 years in a four-billion-mile (6.5 billion km) series of loops around the Sun to pick up enough speed to fly alongside the comet, and it will now release a lander, called Philae, to try to touch down.
But the landing will be extremely challenging, as BBC Science Editor David Shukman explains.

Somewhere dark and icy on a comet 320 million miles away, the history-making, comet-bouncing Philae spacecraft is sleeping. Its batteries are depleted and there isn't enough sunlight to recharge. But while the lander finished its primary job, collecting invaluable data on the surface of comet 67P/Churyumov-Gerasimenko, the Rosetta mission is far from over. For many scientists, the excitement is just beginning.

Tonight, at 11:35 p.m. PST, Rosetta will release its 220-pound lander craft, dubbed Philae, which will slowly descend from a height of about 13 miles onto the landing site named Agilkia, a relatively flat spot on the duck's head. You can follow along here (above) as the landing unfolds on live webcast from the ESA's mission control starting at 11:00 a.m. PST/2:00 p.m. EST today. NASA TV is also providing live coverage starting at 6:00 a.m. PST/9:00 a.m. EST tomorrow.

Whatever the outcome, and the science returned, there will always be questions about the costs of such missions and whether they can be justified in the current financial climate.

On Twitter, Dr Taylor responded to just such a question by borrowing a catchphrase from the irascible BA Baracus character played by Mr T in the A-Team television show: "I pity the fool."

Thomas Reiter, director of human spaceflight and operations at Esa, acknowledged how the top line figure of 1.4bn euros appeared.

But he explained: "If you divide it by the 20 years that the development and the mission has cost, it's about cents per European citizen per year that was contributing to this new knowledge."