Using a time machine would be more difficult than it seems.
Time Machines
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good observation
You’re so smart!
It would not, it would only make the past and present slightly (meaning imperceptibly on the universal scale) more or less dense
Most conceivable ways of building a time machine by their very nature would not be able to send energy or matter further back in time than when the first time machine was turned on. There are many ideas for how to bend space-time that are possible under Eisenstein Relativity, which you might enjoy looking up.
As for the matter of consciously changing the future, I personally changed the future by responding to this post. “The Future” is not any particular path, it is a series of paths that could occur based on what choices are made. To use the example of inventing a time machine, there are essentially infinite variations of two basic paths, one where time machines have been invented, one where time machines have not been invented. Both are (theoretically) equally possible, and various events will collapse those infinityx2 paths into the one that will actually happen. Most of the events (and therefore the path) are not theoretically predetermined at all, as you say, but will be mostly caused by human decisions.
So, like, check it out.
First, there is a universe before time travel is invented. Then some sci-fi adventurer goes back in time, and, say , kills Adolf “the furious Fuhrer” Hitler at birth. Well that might create 2 realities: the one we live in, where Hitler lived; and the new one minus Hitler. In both realities a future will come about in which time travel is “once again” invented. In the first world, “our world,” Hitler is killed by the first time assassin, and then another time assassin is sent back to kill Joseph Stalin. In the world without Hitler the first time assassin can skip straight to killing Stalin. Now you have 3 dimensions: one without Hitler or Stalin, one without Hitler but with Stalin, and our world which includes both Hitler and Stalin in out history.
Alternate realities would just keep being created unless the death of Hitler actually changed the reality from which the time traveler came, which would mean that all the people who died in WWII would have lived and bred, and every sperm that beat the mind-boggingly great odds in order to fertilize an egg probably would not win that race again. Basically, by killing Hitler the sci-fi adventurer would delete the future in which he was conceived and born and replace it with another with a whole new set of people.
Really? that makes so much sense… we either will or we wont i was in a total other direction here thinking the other possible outcome would of been the solution but you’ve truly narrowed it down to two. Thank you sir.
Ok Mr Wizard, thanks.
…IT’S A CARTOON!
If there is no light or matter being sent back, then obviously there was no time machine invented in the future (or should I say there will be no time machine invented). Anyways, the way I see it, is that our only hope for a time machine would be to change a theoretically predetermined sequence of events, and invent a time machine. Basically we either will or we won’t invent a time machine, but most likely we won’t. In addition, there is no way to consciously change the future because we don’t know what the future is. So cheers to the lucky fellow who blindly invents a time machine.
We are all constantly traveling through time.
Currently the trip is only possible in one direction and only at a rate of 1 second per second, though relativity does allow for you to travel faster than others while still yourself only experiencing a rate of 1 second per second.