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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.

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.

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.

A collection of short PBS videos connected to concepts across the curriculum.

Plate tectonics mini-lab.

We have known for some time that Bárðarbunga was going to do something-we just didn't know what. Because it is covered in ice, we rely on instruments to reveal its behavior.

Now that it has stirred, it is giving us clues about what it is about to do. The clues from the patterns of earthquakes and earth movements reveal two clusters where magma is moving toward the surface, and if it gets there, it will erupt. But whether this will be a gentle or a violent eruption is uncertain at the time of writing.

There is no way to predict when the eruption may happen, but we should get a few hours' notice. The good news for air travel is that both clusters are away from the heart of the main volcano, which makes it less likely that an eruption will produce the fine ash that causes disruption.

As Rosetta moved into what's officially called a "hyperbolic orbit", the cameras on board have been busy taking new images of the strange, icy body, comet 67P.

"It was very emotional to see these high resolution pictures," said Dr Holger Sierks, principle investigator of Osiris (the main camera instrument onboard Rosetta).

Nasa's next Martian rover will attempt to make oxygen on the surface of the red planet when it lands there in 2021.

The rover will carry seven scientific projects, aimed at paving the way for future manned missions, seeking evidence of life and storing samples to be brought back in the future.

Among them is a device for turning the CO2 that dominates the thin Martian air into oxygen.

This could support human life or make rocket fuel for return missions

Find out why NASA astronaut Dr. Mae Jemison wanted to go into space in this profile from NOVA's The Secret Life of Scientists and Engineers.

A physician, a chemical engineer, a teacher, a dancer, and the first African American woman astronaut to go to space, Dr. Jemison launched into orbit on September 12, 1992 as a STS-47 Mission Specialist for Space Shuttle Endeavor. During the eight day mission, she and the STS-47 crew conducted 44 life science and materials processing experiments.

Europe's Rosetta probe has arrived at a comet after a 10-year chase.

In a first for space history, the spacecraft was manoeuvred alongside a speeding body to begin mapping its surface in detail.

The spacecraft fired its thrusters for six and a half minutes to finally catch up with comet 67P/Churyumov-Gerasimenko.

"We're at the comet!" said Sylvain Lodiot of the European Space Agency (Esa) operations centre in Germany.

"After 10 years, five months and four days travelling towards our destination, looping around the Sun five times and clocking up 6.4 billion km, we are delighted to announce finally 'we are here'," said Jean-Jacques Dordain, director general of Esa.

Joining Curiosity and Opportunity in 2020, the rover's payload will carry instruments that will cost about $130 million to develop. One of the major goals of NASA's next Mars rover is to process the atmosphere's carbon dioxide into oxygen for human breathing and potentially to oxidize rocket fuel. Scientists also hope to collect rock and soil samples that a future mission could bring back to Earth.

Bring science to life at the touch of a fingertip. Download the latest iBooks Textbooks from KQED! Explore STEM topics and careers through real-world examples. Designed to engage learners through a blend of high-quality media, interactive elements and informative text, the books and accompanying iTunes U courses offer rich learning experiences both in and out of the classroom.

One of the rarest and most exciting events in space exploration is when we land on another celestial body and achieve a boots-on-the-ground view of an alien world. Europe's Rosetta mission is now poised to add another extraterrestrial landfall to that very short list, and top a new list as it becomes the first mission to land a probe on a comet.

Middle School Science Wiki.

Great image showing the scale of things in the universe.