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Hi Chris
When you take many subs, each sub has the (desired) real signal for the object(s) you are imaging and the (unwanted) random background noise from heat, electronics, seeing, etc.
When you align and stack several subs the "fixed" real signal is reinforced and "adds up". The noise, which is random, is reduced as it varies from sub to sub.
If you only have a single sub and add it to itself, the random noise is in the same position on and will therefore also add up and not reduce.
Cheers
Dennis
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