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I can think of two big reasons right off the top of the bat:

1). Radio signals are influenced by a trip through the atmosphere much less than
optical ones are, so the downside of observing them from the surface is far less.

2). Radio telescopes operate at wavelengths that are perhaps 15,000 times the
wavelengths at which optical instruments do. So for comparable sensitivity and
resolution, a radio telescope has to be 15,000 times the size of an optical one.
Armed with this fact, your average Congressperson is not likely to support the
program to fund a proposed Jansky Space Radio Telescope.


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12y ago

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