Comets look very special, even mysterious. They glow or shine if they are close to the Sun. Everybody knows it is a comet because they have that long tail.
But what a comet is made of? Is it ice, rock or something else? Scientists wanted to find out and they built the probe.
It was a long process and the journey took about 10 years! That means that the comet is very very far! Now the probe is exploring the comet - it's drilling the surface, testing the chemicals and so on - and ... posting the news on Twitter! That's amazing, isn't it?
more at:
http://en.wikipedia.org/wiki/Rosetta_(spacecraft)
http://www.bbc.com/news/science-environment-30058176
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