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Was new technology developed for Rosetta and can it be reused for other ESA missions?
The solar cells in Rosetta's solar panels are based on a completely new technology, so-called Low-intensity Low Temperature Cells. Thanks to them, Rosetta is the first space mission to journey beyond the main asteroid belt relying solely on solar cells for power generation. Previous deep-space missions used nuclear RTGs (Radio isotope thermal generators)…
Systems that control the temperature inside the spacecraft are another example of technological spinoffs from the Rosetta mission. When a spacecraft is near the Sun, overheating is a problem, and can be prevented by using radiators. But in the outer Solar System, the problem is keeping the spacecraft and its subsystems warm. The system devised for Rosetta employs several new techniques, including the installation of louvres over the radiators, to keep spacecraft hardware at proper operating temperatures.

Часть станции Rosetta на фоне с кометой Чурюмова-Герасименко
Специалисты ESA выбрали основную и альтернативную точки посадки для зонда Philae/Rosetta на комету Чурюмова-Герасименко