        His biggest fear was that they had just accidentally stumbled on the planet.  If the mothership was a ways out, they might have just beamed down from far enough away that they hadn’t noticed the satellites and all the other clearly unnatural junk that orbited the earth.  It could be that they hadn’t expected to find an occupied planet, so they’d left their scanners off.  If that was the case, then everything they discovered about the planet was news to them, and that was a problem.