At bottom left is a red arrow pointing to an artifact found on Comet 67P. The photo was taken minutes before Rosetta spacecraft crashed onto Comet 67P on Sept. 30, 2016. Image credit: ESA/Emily elakdawallaImage source: the first image in planetary.s3.amazonaws.com/emily/Rosetta.rar
Added on Oct. 2, 2016: Martian Landscape and Broken Container Found on Comet
The first figure above was turned 90 degrees into this figure. At upper left is a red arrow pointing to a broken container found on Comet 67P. Two yellow lines mark black shadows from the container. Green line and white line mark the top and bottom of the broken container. Blue line marks the raised part of the broken container.
Added on Oct. 3: Correction to the above—Not a Container, but Two Curly Artifacts Contacting Each Other.
I reviewed the first photo in its original size and found the red arrow actually points to two curly artifacts that contact each other. Although it is not a broken container, they are still artifacts. Some people may think they are rocks. They are not natural rocks, for the following reasons:
1. Most astronomers think comets were condensed from cosmic clouds over 4.56 billion years ago and remained pristine ever since, except for solar radiation, etc.
2. The comet has no magnetism/volcano/river/lake. So the comet could not form igneous or sedimentary rocks.