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My first thought on reading the title of the OP was 'I wonder if we've already ruined Mars with unhelpful yeast?'.

Surely there's nothing for it to eat there yet though.

When jupiterians come to explore mars they'll face a horror movie scenario with long dormant alien pathogen eating through their carbohydrate shells.

I think they prefer "Jovians".

That's just our word for them, just like Protestants is a Catholic umbrella term for most other denominations.