Telescope Needs a Month to Reach Optimal Operating Temperature

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SUMMARY

The discussion centers on the cooling process of telescopes in space, specifically addressing why it takes approximately a month for a telescope to reach its optimal operating temperature. The primary reason is the lack of air molecules in space to facilitate heat transfer through convection and conduction. Instead, spacecraft rely on radiation to dissipate heat, which is a slower process. Additionally, achieving near-absolute zero temperatures presents significant challenges due to incoming radiation from celestial bodies like the Earth and the Sun.

PREREQUISITES
  • Understanding of heat transfer mechanisms: convection, conduction, and radiation
  • Familiarity with the concept of vacuum and its effects on thermal dynamics
  • Knowledge of spacecraft thermal management systems
  • Basic principles of thermodynamics, particularly relating to temperature and heat dissipation
NEXT STEPS
  • Research the design of spacecraft heatsinks for effective thermal radiation
  • Explore the principles of thermal vacuum testing for aerospace applications
  • Learn about the challenges of achieving near-absolute zero temperatures in space environments
  • Investigate the effects of solar radiation on spacecraft thermal performance
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Aerospace engineers, astrophysicists, and anyone involved in the design and operation of space telescopes or spacecraft thermal systems.

Echo 6 Sierra
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Reading the article at http://www.msnbc.com/news/961142.asp?0dm=C13NT I saw that it said the new scope needed about a month to cool down to optimal operating temperature. Why would it take a month?

E6S
 
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Because there is nothing out in space for the object to conduct heat to.

An oven cools down because cooler air molecules bump into it, and take energy away.

In space there are very few molecules around, and those that are there are usually highly energetic. For that reason, spacecraft 's heatsinks need to be designed to radiate heat away as electromagnetic radiation - a much slower process.
 
Heat transfer occurs via convection, conduction, or radiation. As enigma said, convection & conduction are kinda tough in the vacuum of space. Radiation is slower and also has to fight against incoming radiation from other sources (like the Earth, sun).

Not to mention that getting down to near-absolute zero is no easy task.
 
Thanks fella's.
 

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