2. Things are already heating up. As the comet's orbit brings it closer to the Sun, the rising heat will cause dust and gas to fly off the comet's surface. Rosetta will use various sensors analyze this comet debris, to figure out what the comet is made of. Already, "jets are sprouting up everywhere," said astronomer Dennis Bodewits in a press release. "We've been surprised to see how active it is. It already has more jets than many other comets do at perihelion." So far, it looks like most of the debris is coming off of the 'neck' of the comet, where the comet's 'head' and 'body' join together, as well as the side facing the Sun.