Sky & Telescope December 2023 Magazine

Sky & Telescope December 2023 Magazine

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In the December issue, dive into the Andromeda Galaxy’s past with an in-depth look at our galactic sister. In doing so, we discover our sibling has had a surprisingly different history! Dozens of other galaxies await your telescope, as we explore the faintest — but still accessible — targets in the most popular catalogs. Careful observing can get you to the farthest reaches of the cosmos, but it can also bring you closer to home. E. M. Andoniadi’s visual observations of Mars and other planets were truly in a league of their own. Also in this issue, learn about how magnetic fields can shield planets’ atmospheres — or perhaps hasten atmospheric loss.
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