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There is also a type of DIY telescope attachment for the viewing of the sun, which its inventor calles "SUN GUN":
http://www.sunguntelescope.com. As of Sept 2012 one of those was in operation at the Observatory of the
National Air and Space Museum, and several other major science centers also have one, so it could be quite well-known.
I think the concave mirror part from space is a problem. Because with a new target, to concentrate on a different distance, the concavity would have to change for aiming in order to concentrate the light. I think you need a straight mirror, reflecting a strong beam of light from the earth, created from a solar concentrator which is shot straight up, to a sattelite with a straight mirror. — Preceding
unsigned comment added by
2601:581:C300:290:B80A:D9B8:907:BCD9 (
talk)
02:11, 1 December 2021 (UTC)reply