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What is the name of the telescope that Alvan Graham Clark used to discover Sirius B?
Hubble Space Telescope
Keck Observatory
18.5-inch Clark Refractor
Palomar Observatory
Answer
Alvan Graham Clark used the 18.5-inch Clark Refractor telescope to discover Sirius B. This telescope was made by his family's company, Alvan Clark & Sons, and was known for its high-quality optics and precision.
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