There are two optical telescopes operating at the exact same frequency

There are two optical telescopes operating at the exact same frequency.
The first telescope is a 18 m telescope that is planned to be located at the L2 Lagrangian point 1.5 million kilometers past the orbit of Earth. The second telescope is 2 m telescope that is planned to be placed on far side of moon 380,000 km from the Earth. The 18 m telescope has a greater light gathering power by a factor of ________times

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