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This sequence of images, taken with Rosetta’s OSIRIS narrow-angle camera on 30 July 2015, show a boulder-sized object close to the nucleus of Comet 67P/Churyumov–Gerasimenko.
The images were captured on 30 July 2015, about 185 km from the comet. The object measures between one and 50 m across; however, the exact size cannot be determined as it depends on its distance to the spacecraft, which cannot be inferred from these images.
The comet 67P has just passed perihelion (the closest part of its orbit to the Sun) and has been experiencing heightened activity, complete with powerful jets of gass and dust.
Scientists estimated that material in the jet was travelling at 10 metres per second, or possibly much faster.