Breaking open the inside of a comet
With the planned landing of a probe on a comet, here's an overview of a typical elements of what scientists might find.
The European Space Agency announced on Monday that its probe Rosetta will attempt to land on comet 67P/Churyumov-Gerasimenko this November.
The attempted landing will be tricky. There is negligible gravity, the surface is hard and the comet is travelling at 55,000 kilometres per hour.