You head out to explore the forest. As you walk you start to experience vertigo (dizziness). Suddenly, you see the Koala Bear animals behind you with teeth bared. They’re charging silently straight at you.
You run and run…
Straight off a cliff. If anyone was to find you, they won’t (you’re on a new planet), but they’d find that your body and mind were decaying from the radiation in the gas cloud. This caused your dizziness and hallucinations. There weren’t any Koala Bears chasing you, you just thought there were. You’re dead. Too bad, it’s a cool planet.