What powerful ground-based telescope did Hubble use at Mount Wilson Observatory for his measurements?
Answer
100-inch Hooker Telescope
Edwin Hubble performed his critical observations of the Andromeda Nebula from the ground at the Mount Wilson Observatory in California. The specific instrument employed for this monumental task was the massive 100-inch Hooker Telescope. This powerful reflector was instrumental because resolving individual stars within the faint, fuzzy structure of M31 represented an immense technical hurdle, requiring the light-gathering power of this specific instrument to detect stars millions of times fainter than the brightest naked-eye stars.
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