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Re: Telescope Design, Geodesics And The NGST

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Posted by Alexander on January 22, 2001 23:48:44 UTC

Plates can not be used in reflectors (Hubble) as their refraction index changes with color, so they will introduce chromatic aberration. And I have not heard about plates in refractors either (they use set of correction LENSES but not PLATES).

Second remark. Because of matter/energy in it our space-time is not Euclidian, and namely due to that we have gravitational red shift from heavy objects and due to their relative motion - Doppler red shift. Namely due to those shifts we know how and where to things in Universe move (or how heavy some things are). So there is no need to correct what we see, vice versa - the difference between what we suppose to see according to flat space gives us curvature, mass, velocities, etc.

Third one. Flexible mirrors are used to compensate for air currents in atmosphere (causing twinkling), so you do not need them in space.

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