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bigger telescopeScientific American
•72% Informative
Many people think a telescope’s purpose is to magnify images.
While magnification is important, a telescope's real strength is in its resolution.
Resolution is the ability to distinguish two objects that are very close together.
The Hubble Space Telescope has a mirror that is 2.4 meters wide, so you’d expect it to have higher resolution.
A telescope’s maximum resolution is the minimum separation that it can distinguish between two objects, expressed as an angle.
The moon, for example, is half a degree wide in the sky, which is 30 arcminutes, or 1,800 arcseconds.
At its best, Hubble 's resolution is about 0.05 arcsecond—a very tiny angle! At those distances, Hubble can resolve objects a few light-years across.
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