subject to stringent constraints in FCC and International Regulations, but there remains some concern that very sensitive receiving systems operating near 2.^5 GHz or harmonics may experience interference. (4) Effects of Scattered Sunlight from SPS Spacecraft: Each spacecraft will, even if it scatters only 4% of the sunlight it intercepts, be brighter than any other object in the night sky except the moon (as bright as the planet Venus at its brightest). Sixty SPS spacecraft will have the effect of a fractionally illuminated moon always present in the night sky. This would cause substantial interference with ground-based astronomy and other scientific observations of the night sky requiring dark conditions. Mitigation would require substantially darker SPS spacecraft or relocation of a number of observational facilities to space.
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