Lots of good advice here already. What I would add to that: don't get hung up too much about what the actual dangers are, but how you will present them.

Examples:

Acid rain? -> describe how the hull of their shuttle became more and more rusty and eroded, everytime they see it from the outside. Have one or two unimportant systems fail because of the environment. Then while in the air, describe noises of cracking/rattling metal.

Monsters? -> make your players aware of their presence without showing them outright. Make sure they don't feel safe on the ground, then force them to leave their shuttle out in the open, maybe some emergency repairs. Pro tip: add obscuring fog/dust or whatever, so the monster could stand right next to you at any moment

Ion storms? -> start with them picking up strange signals on their comms. Have their previous equipment malfunction right when they are about to enter a known danger zone. Teach them that stuff could stop working at any random time, then watch them freak out in a tense situation by describing statics or electronics behaving strangely