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Astrophotography, with Dr. Robert Gendler

B&H Photography Podcast

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The Andromeda Galaxie - Is There a Way to Find Out?

When we look at the moon, it's like three quarters of a second ago that we see a the sun is wat nine minutes. And each star goes because it's its older images, it takes time for the light to get here. So when we are looking at a, say, the andrometa galaxy, for instance, as a good example, we know that it is x amount of light years away. Is there any way of determining, based on the layers of imagery that you have, how long ago the closest point occurred? What's the depth of time? Has anyone ever figured that out? A, yes, i suppose there is.

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