How does making a refracting telescope very long reduce the chromatic aberration of an uncorrected lens?
How could a 20 inch space telescope "be able to make out Earth-size planets" orbiting Alpha Centauri?
Under what situations can an aperture mask improve the resolution of a small/medium amateur telescope? Is this demonstrable mathematically?
How did VLT's adaptive optics obtain this resolution for Neptune? Is it really working in visible wavelengths?
Do point spread functions from large single telescopes using adaptive optics still look like Airy functions for narrow-band filters?
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