Re: ATM Expansion calc. Deformation in mirrors as a function of thickness variation to delta temp

[Andy Saulietis <iss@pvtnetworks.net>]

Frank Ward writes,

>> I often wonder how Hubble is protected  in a vacuum from solar heating
>> and deadly cold.

The front baffles on the HST shield the optics from
direct sunlight and earthlight by managing the attitude
of the spacecraft such that these sources are a minimum of
45 deg  away from the pointing direction. This is why
HST can never view the inner planets. Insulation, reflective
shields, and low expansion metering trusses keep it
stable.

  

Andy Saulietis
ISS Enterprises
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