Thursday 21 August 2014

Rosettas comet conundrum

At some point in your life you've probably experienced the holiday headache. Where should we go this for our summer getaway? The south of France, Disney land Orlando, the Great Barrier Reef? Wherever you go, at least you know you will have a great time. The risks involved are pretty small.

The team behind European Space Agencies mission Rosetta aren't have such an easy task though. Rosetta made contact with the comet 67P-C/G this month. An incredible mission that will study a comet in close detail. It will hope to learn more about what comet structure and composition is as well as learning about the early solar system. It is currently orbiting around the comet, studied the outside of it. But the really exciting part of the mission will happen in November when the lander part of the mission Philae will land on the comet to study its surface.

We don't know much about the surface of comets, but what we do know is very general and is likely to vary from comet to comet. This is worrying for the team that has to land and attach Philae to the comets surface. They would like to land it somewhere stable enough for the lander to remain for the entire mission, somewhere it is unlikely to get damaged, somewhere where it can access the surface of the comet and look as deep in to the centre as possible. The amount of sunlight the lander receives is also vital, ruling out many areas of the comet already due to its spin and unusual shape. This is not your usual holiday headache of where do you go, this is a comet conundrum!

The surface of the comet has been studied for the last couple of weeks since Rosetta has been orbiting the comet and scientists will officially announce in the next week the landing site they have chosen. We will then all keep our fingers crossed for a successful landing in November for what will be an incredible feat for space exploration.

Artist impression of Philae on the surface of 67P/C-G. Credit: ESA/ATG medialab

You can read more about this on the ESA website:
http://blogs.esa.int/rosetta/2014/08/21/landing-site-selection-the-race-is-on/

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