“The scale of the Hubble/VLA/Chandra image is probably on the scale of arcminutes (1 arcminute = 60,000 milliarcseconds).”
“Groups and clusters of galaxies can be effectively found using their extended x-ray emission on sub-arcminute scales.”
“However, this does not take into account the optics of the system which degrade image quality somewhat giving a commonly accepted resolution of 1 arcminute/cycle.”
“So, if a normal human eye can discriminate two points separated by 1 arcminute/cycle at a distance of a foot, we should be able to discriminate two points 89 micrometers apart which would work out to about 287 pixels per inch.”
“See, I'm just biased towards interferometers; -) ** One arcsecond is 1/60th of an arcminute, and one arcminute is 1/60th of a degree.”
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Unusual, arcane, or obscure units of measure
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