Well going into space requires some different suit equipment per location you go to.
There are 4 upgrades for all different types below you will see them all
Increases time you have air but requires more aircanisters to fill
first upgrade adds jetpack next ones enlarge the fuel tank to fly
protects against radioactive environments
protect agains very hot environments
Make the upgrade you need (note that you start at 1 you cannot upgrade to 3 at once)
put on your space suit
Shift leftclick a anvill while holding the upgrade for the suit.
To check if the suit is upgraded simply look at the item itself it should increase the number on the level of protection or size
The upgrades work in 1 direction you cannot downgrade or upgrade by skipping levels. Its always 1 > 2 > 3 > 4
The suit upgrade each uses rare materials to upgrade it. for example silicon comes from braincoral. emeralds are also something you need to find or trade. so be prepaired that its not easy to get them all
The space suit once fully upgraded is a very handy tool on all worlds. especially the jetpack it allows flight if you have fuel in the suit, becarefull tho if ur suit run out in mid air u will fall!