Humanity is on the verge of extrasolar colonization when an alien race reveals to us that we are carriers of an incurable virus that could wipe out life in the universe if it ever spread beyond our stellar system.
Technically, friends, only the system centered around Sol is a solar system; the correct generic term is stellar system.
Speaking of generic terms, alien is a generic adjective, not one derived from a proper noun, so don’t capitalize it.
(And speaking of alien, I always hated how the people on the Babylon 5 space station were described as “humans and aliens” rather than just as people.)
Mercenary Proofreader is not impressed by the bio-science ignorance of these aliens. Obviously humans aren’t dying of the virus, so there must be something about humans that makes ’em resistant, immune, whatever. Couldn’t someone, y’know, study the disease-resistant species and figure out why they’re not dying, and then apply that knowledge to giving immunity to everyone else, too?