NASA's new IR scope

  • #1
Echo 6 Sierra
25
1
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
 

Answers and Replies

  • #2
enigma
Staff Emeritus
Science Advisor
Gold Member
1,757
17
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.
 
  • #3
Phobos
Staff Emeritus
Science Advisor
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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.
 
  • #4
Echo 6 Sierra
25
1
Thanks fella's.
 

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