What Device do largest telescopes in world use to collect as much light as possible?
The largest visible-light telescopes in the world use what device to collect as much light as possible before the light is brought to a focus (to act as the light bucket)?
A. a lens
B. a spectroscope
C. a CCD
D. a mirror
E. a valley in Puerto Rico
a mirror.
Universe / Galaxy structure measured out to 2 billions light years distance.
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