Quote:
Originally Posted by gregbradley
I see. I have combined new and old sets
before and did not notice any issues there.
Greg
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Thank you for confirming that Greg.
I did a quick calculation for the Helix, and it would take about 40 years to have the nebula expand by one pixel when imaging at 1 arcsec per pixel. It would be even less movement for the most of the objects located further away. So we should be able to integrate data collected even a few decades apart without any noticeable effect on the sharpness of the image, maybe with an exception for the few really fast moving stars.