Churyumov-Gerasimenko is a comet which travel our solar system. It's made of 2 lobes also scientists call it "the duck". The surface is made of dusts and it's more dark than coal. Scientists suppose that the comet is made at 90% of bubbles of void like a piece of cheese. The comet is made of a black material which has similarities with the coal and the Kerogen.
For now the composition of the project is :
- Polyaromatic organic solids
- Sulfides
- Fe-Ni alloys
Some photos taken by OSIRIS (the most powerful camera instrument on Rosetta) reveal areas of ice of water: