Just a day after they announced that Rosetta could be flying by the end of the month, the European Space Agency decided to put the mission on hold indefinitely because of their concerns with the Ariane-5 rocket. Unfortunately, since Rosetta won’t be launching by the end of the month, it won’t be able to meet up with Comet Wirtanen. by 2011, so the entire mission will need to be redesigned to seek a new target.