5

is the best possible angular resolution that can be achieved. 7. Because of atmospheric turbulence (which causes the stars to twinkle), even the largest Earth-based telescopes have a practical resolving power of between 0.5 and 0.25 arcsecond. 7. Operating above the atmosphere, the Hubble Space Telescope has a resolving power of 0.1 arcsecond ... ................
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