Your fault you don't know how to roll the dice

Blame the internet! www.roll-dice-online.com! .... Until I got my combat script written xD

I just roll actual dice if i ever need to

That's how I became a Devastator Marine!

Power Armor easily can withstand Space Temperatures which is 2.7 Kelvin or -270 degrees celsius or -454.81 degrees fahrenheit. Soooo no worries as long as you got your armor seals undamaged xD

deep space rarely goes below -150 celcius. hence why there are still gass clouds.
The coldest you get is intergalatic space with goes down to around 10-15 Kelvin

If powerarmour could take down towards 1-2 kelvin then it would be made out of soledefied hydrogen atoms in a permanent state of frozen solid
Around planets vacuum space can even be warmer than the planets poles

http://www.bbc.com/future/story/20130920-how-cold-is-space-really

Also Space Marines can survive in the void for weeks, especially if they go into artificial coma that they can self-inflict. As they go into super hibernation mode.

That is in the deepest of deepspace. No arstartes suit Will go there. And if it did both stasis weapons and Helfrost would be rendered useless, not allmost as effective as plasma with a twist.

We wouldent have galactic gassclouds if normal intersolesystem space Got intergalatic deepspace cold

I am not saying their armor won't freeze and seal up. I am saying a Space Marine survives that.

OOC: I insinuated you arrive later than @DeranVendar & @matt23 out of fairness so you don't block them, they went there first