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That depends on what you mean by "fast".

Here are some statistics, from which the answer to the question

you actually have in mind can probably be teased out:

Celestron 8:

Objective mirror diameter . . 8 inches

Objective mirror area. . . . . 50.3 square inches

Focal length. . . . . . . . . . . 2,032 mm

Focal ratio. . . . . . . . . . . . f/10

Speed. . . . . . . . . . . . . . . solidly anchored for observing

HST:

Objective mirror diameter . . 2.4 meters (94 inches)

Objective mirror area . . . . . 7,012 square inches

Focal length . . . . . . . . . . . 57.6 meters

Focal ratio . . . . . . . . . . . . f/24

Speed . . . . . . . . . . . . . . . 4.66 miles per second (16,800 mph)

And PLUS . . . Hubble operates with zero atmospheric absorption or turbulence.

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11y ago

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