Abstract
When you take a picture of any astronomical object you are going back in time. Even a pic of the Moon captures it as it was about 1.3 seconds before you took the exposure. This is because the speed of light – roughly 186,000 miles or 300,000 km per second – has a finite and not infinite speed. The farther out you go with your camera the farther back in time you are photographing.
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Redfern, G.I. (2020). Telescopes. In: Astrophotography is Easy!. The Patrick Moore Practical Astronomy Series. Springer, Cham. https://doi.org/10.1007/978-3-030-45943-7_4
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DOI: https://doi.org/10.1007/978-3-030-45943-7_4
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