Their predictions range widely, from sophisticated civilizations that could advance human civilization in many areas to imperial powers that might draw upon the forces necessary to subjugate humanity.
Prior to the film's opening five-day weekend in the United States and Canada, predictions for its weekend performance ranged from as low as $70 million to as high as $125 million.
No one knows just how long it will take to put out the fires; predictions range from two more weeks to several months.
Because the exact amount of time this accretion process took is not yet known, and the predictions from different accretion models range from a few millions up to about 100 million years, the exact age of Earth is difficult to determine.
These predictions can range from the sensible, to the outright absurd, and are often similar from year-to-year.
For other campuses, the predictions range from no change in California, where the state Constitution bars universities from taking race into account, to significant change in Texas, where the 1996 Hopwood court decision barring the use of affirmative action is now inoperative.
Guests' predictions of when the first Pakistani nuclear device would be detonated ranged from Monday or Tuesday of this week to never.
The fearful predictions range from an increase of one-half of a percentage point to no increase at all.
Even so, predictions range from the ability to reproduce things like diamonds and food to the world being devoured by self-replicating nanorobots.
But the predictions range from "nightmarish" to - and I know it sounds callous taken out of context - "people will keep dying, but overall, we're not too worried about the situation".