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X+Y X+Z X-Y-Z
X-2Y-Z X X+2Y+Z
Terms not in common: X+Y+Z VS X+Y-Z AND X-Y-Z VS X-Y+Z
X-2Y-Z VS X-2Y+Z AND X+2Y+Z VS X+2Y-Z
X+Y X-Y-Z X+Z
X-Y+Z X X+Y-Z
X-Z X+Y+Z X-Y
There is no Extraterrestrial life
There aren't any suitably capable Extraterrestrials
Interstellar travel is too difficult
We're too uncool / not worth the trouble
What do you mean they haven't visited?
Results (563 votes). Check out past polls.