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Andromeda Galaxy - properly stacked

Instead use software which matches stars between frames and superimposes them -
148 exposures, each f/4.5 ISO6400 8s (total = 19.7 minutes)
Many more stars than can be seen with the naked eye

There has been some further processing after stacking to neutralise the brown background.

You can now begin to see (in the inset) that the galaxy has a shape similar to a fried egg. There is a bright central bulge and the outer disc fades away. We are viewing it obliquely. We will see a better view later.

The huge number of stars makes it difficult to pick out any constellations, so we will mark some on the next slide...

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