# Small Star

**URL:** <https://boards.straightdope.com/t/small-star/782438>\
**Category:** Factual Questions\
**Created:** [March 17, 2017, 9:09pm UTC](https://boards.straightdope.com/t/small-star/782438 "2017-03-17T21:09:58Z")\
**Posts on this page:** 2\
**Page:** 2

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**Author:** ![Chronos](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/chronos/32/134_2.png) [@Chronos](https://boards.straightdope.com/u/Chronos)\
**Post date:** [March 27, 2017, 10:34pm UTC](https://boards.straightdope.com/t/small-star/782438/21 "2017-03-27T22:34:14Z")

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Well, you also have to define what you mean by cooling down “completely”. By the Third Law, it’ll never exactly get to the temperature of its environment, so you have to set some temperature that you can call “close enough”.

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**Author:** ![Lemur866](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/lemur866/32/434_2.png) [@Lemur866](https://boards.straightdope.com/u/Lemur866)\
**Post date:** [March 28, 2017, 1:15am UTC](https://boards.straightdope.com/t/small-star/782438/22 "2017-03-28T01:15:14Z")

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Close enough I guess should mean “if I were close to it and looking at it with my Mark I eyeballs, I wouldn’t see it glowing in the visible spectrum.” So something under 800K.

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