Hole in Harry's logic *spoiler*

Wrong.

Harry only assumes the blast destroyed the sphere, but we see it fly away after they all wish to forget, so it obviously was not destroyed.

haha so wrong,u should really watch the endings of movies

The flaw isn't in Harry's logic, it's in yours. Think about the timeline: The sphere was found in deep space in xx43; the spaceship ended up back at Earth over 3000 years before the movie took place, carrying the sphere with it. You have to look at the timeline of the sphere, not of the actions taken place. Otherwise, you end up in a paradox.

The same sphere will be in an infinite loop, being found on Earth in the 1990s, removed by the main characters at the end of the movie, found in space xx43, returned back to Earth over 3000 years ago, found on Earth in the 1990s, removed by the main characters at the end of the movie, found in space xx43, returned back to Earth over 3000 years ago, found on Earth in the 1990s, removed by the main characters at the end of the movie, found in space xx43, returned back to Earth over 3000 years ago, ad nauseum.

This would be like you traveling in time when your thirty, handing yourself a watch when you're 12, then when you turn 30, you go back in time to give yourself that very watch. It's a paradox; the watch is infinitely old. It's best to rethink any argument that leads into a paradox, unless the paradox is the center-stage of the story. In this case, it's not.

The sphere is found in xx43, brought back in time, found, and destroyed. Who manufactured the sphere is not told, but it's not important; what is important is that the sphere will be there in the future when the spaceship finds it.

I hope that helps.

I hoped this answers your question...

Yes Harry decides by matter of deductive logic that they "die down here" because the ship's list a blackhole as an "unknown entry event" so they never told anyone what a blackhole is and that it could be used for time travel, and since the future cant be changed they wont ever tell anyone about blackhole and time travel.

When Harry said "the sphere is destroyed" he assumes the sphere is destroyed, when in reality it wasn't, it flew back up into space where it will be discovered some 50 years from that point in time to start the process all over again. I made an argument on another thread that the Navy seeing the Sphere shoot off into space is what promps the Navy to build a spaceship to go after the Sphere...But by using the power they had to make themselves forget about the Sphere and the powers they had along with the blackhole the spaceship encounters, that solves the riddle about them never telling anyone about blackholes.

as far as i know they dont rediscover the sphere in the ocean (in this timeline anyway).

so whether its desrtoyed or not is really irrelevant. unless you wanna go with the loop theory. but thats when things get confused.

basically the only time it gets rediscovered is in space when the black hole happens and it crashes. well thats what i think anyway

No, the assumption is that if the present day team comes to the surface they would tell the government and the scientists who would record the event in their computers so that later in the future when the spaceship is finally built to journey out to space to find the sphere they would know about the blackhole but if they knew not to approach the black hole and get sucked thru then they would never have ended up being crashed on earth in the past thus the present day crew wouldn't be there evaluating the sphere in the first place.

Confused?

But by doing what they did and "forgetting" about the sphere then nobody learned about the fate of the future space crew and the sphere so they didn't anticipate being sucked thru the black hole and thus their future fulfilled itself.

were there two different endings to this movie? i just saw it again and it ended with the sphere shooting off into space, but i swear i saw an ending where they were questioned about the event and Dustin Hoffman says something like, "Sphere? No, I don't remember anything about a sphere." somebody help me out with this.

Harry uses "deductive logic" to come to that conclusion. That would be a logical conclusion given the circumstances of the film. He can not foresee them making it out alive and having the ability to magically "forget" their magical power of subconscious manifestation.

At the end of the film, Harry is not using "deductive logic," he is making logical assumptions, not realizing the sphere is somehow invincible. However, if he would have been using deductive logic at that point in the film, he would have came to the conclusion that him seeing the sphere in the first place meant that it hadn't been destroyed, because if it were destroyed it couldn't have been brought back through time to be discovered by he and the rest of the team.

I think you may have seen the version where they bypass showing the sphere sailing off into space on its own accord, magically once again. There isn't a hole in his logic exactly, he's just not using the same logic when he says "the sphere is destroyed" as he was when he said "we will all die down here."

The ending of this movie was totally ridiculous, you'll end up in an infinite loop of time trying to make sense of it.