The Occulter satellite has a large circular disc to block the Sun’s dazzling light, creating an artificial eclipse that will be seen by its partner.
The Coronagraph satellite carries a special telescope to study the Sun’s corona in detail.
Together, these innovative satellites will create long-lasting eclipses in space, allowing scientists to observe the corona for up to six hours at a time!
source:https://www.esa.int/kids/en/news/Proba-3_when_two_satellites_are_better_than_one
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