What i dont understand is how did the Orbital Nuke of LV-426 go horribly wrong?It went ''Bang'' Didn't it.Even the Nostromo,i hope they tell this story well.After Duke Nukem im gonna be a skeptic,not putting all my eggs in one basket.
There was no orbital nuke.
People seem to forget this because of the exchange of lines between Ripley, Hicks and Burke. "Nuke the site from orbit. Its the only way to be sure"
Obviously a orbital nuke would have been more effective than the reactor malfunctioning, but for the sake of this game, Ripley and company didn't think of that.
For the purpose of the game, the reactor's explosion still would have killed all humans at the colony but who knows about the Xenos.