What is the purpose of the 4 vents at the aft section of the Hubble Space Telescope? The spacecraft is operating in vacuum and the interior of the telescope is devoid of any gas, so venting seems pointless.
Venting might have played some role during ascent to orbit (when the telescope had to get rid of the air inside the instrument section), but whether this is the case I'm not sure. Can there be other reasons behind that?