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The reflector telescope uses a mirror to gather and focus light. All
(including those in our solar system) are so far away that
all of the light rays coming from them reach the Earth as parallel rays.
the light rays are parallel to each other, the reflector telescope's
a parabolic shape. The parabolic-shaped mirror focusses the parallel
to a single point. All modern
research telescopes and large amateur ones are of the reflector type
its advantages over the refractor telescope.
Alas! Despite the advantages of the reflector telescope, astronomers must
contend with some minor annoyances.