HISTORIC COMET LANDING TOMORROW: The European Space Agency is about to make history: On Nov. 12th, it is going to land on a comet. The action begins Wednesday at 08:35 UT when ESA’s Rosetta spacecraft drops a probe named “Philae” onto the core of Comet 67P. This video shows what happens next:

In the past, nations of Earth have landed on planets, moons, and asteroids, but never before on a comet. This is an important and daring first. “A comet is unlike any other planetary body that we’ve attempted to land on,” says Claudia Alexander of the US Rosetta Project at JPL. “Getting Philae down successfully will be an incredible achievement for humankind.”

“How hard is this landing?” asks Art Chmielewski, the US Rosetta Project Manager. “Consider this: The comet will be moving 40 times faster than a speeding bullet, spinning, shooting out gas and welcoming Rosetta on the surface with boulders, cracks, scarps and possibly meters of dust!”

Philae will take 7 hours to fall 22.5 km from the spacecraft to the comet–an interval some mission scientists are calling “The Seven Hours of Terror.” Confirmation of the landing will reach ground stations on Wednesday at approximately 1600 UT. You can follow the descent as it happens by tuning in to ESA’s #CometLanding webcast.

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