When the Twin Keck Telescopes Were Built in the 1990's

question 2

Multiple Choice

When the twin Keck telescopes were built in the 1990's, what distinguished them from other very large telescopes of the time?

• A) they were reflectors, while other large telescopes were all refractors
• B) they were on a mountain, while all other telescopes had been built near big cities
• C) they used a mirror assembly that was made of 36 smaller hexagonal mirrors working together
• D) they had a smaller overall aperture, which made it easier to take pictures
• E) they had a motorized drive system to allow the telescope to move smoothly

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