Summary: Rosetta is a esa spacecraft that is currently trailing behind a 10-ton comet. The spacecraft with later touchdown and begin studying the object in detail, but important parameters still need to be found out about the comet first. In order to determine a perfect landing spot, there are currently five remaining candidates, the exact center of mass needs to be determined. This means finding out information about the size and material makeup of the celestial body. So far most of the data has confirmed what the scientists already knew and hopefully should not delay the initial touchdown in November of this year.
BBC News
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