BAAO — 2024 Astronomy & Astrophysics Challenge
Question 5
The Euclid space mission, launched in 2023, will image 36% of the sky in extremely high resolution to investigate the nature of dark energy and dark matter by looking at the shapes of huge numbers of distant galaxies. The visible instrument (VIS) consists of a 6 × 6 matrix of 4096 × 4132 pixel CCDs. If the scale of the image on the CCD is 0.101″ pixel⁻¹ in each axis, estimate the minimum number of photos the instrument needs to take to get the planned coverage (ignoring any gaps between the CCDs)?
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Source
Source: British Astronomy and Astrophysics Olympiad (BAAO), Astronomy & Astrophysics Challenge 2024. Question text, answer-choice text, and answer were transcribed from the official BAAO paper and solutions PDFs; the explanation and metadata are original.