So, I've been doing some research for a novel I'm working on that's based around time travel, but seeing as I'm definitely no expert on the theories concerning it, thought it might help to have someone a little more knowledgeable on the subject review my ideas. Thus far, I've done some reading up on it, and know the basics. From what I've gathered, time travel is possible, but not to any point in time before the hypothetical date when it's invented (however, one reputable source I found seems to dispute this, commenting on a traveler being able to encounter dinosours, but I'm assuming that's generally not the consensus, right?). There seem to be three methods of travel that are widely discussed as possible: orbiting a black hole, traveling at near-light speeds, and wormholes, though out of these three, only the wormhole option works for what I'm attempting to envision - a method of time travel that could transport people to the future, and then back to the time they left. If all that's correct, great, but if not, do let me know. :) Now, onto my question... well, questions. :p Could there - hypothetically - be a way to either create a wormhole or locate and use a preexisting one on Earth, not in space? If so, what might that look like, how might it be accomplished, and what materials/components would be involved? If someone were to go through it, what might they experience? And, finally, once they get to the the other side, assuming any components needed to use/operate such a wormhole were maintained over the years by future generations, could the traveler go back to their own time? Oh, and I'm also curious whether having a traveler be able to change their future - but the past of the time they travel to - would be realistic based on what we know now. From what I've found, this seems to be quite the subject of debate, so to clarify, I'm not looking for personal opinions or reasoning, but rather checking that there isn't any evidence to dispute this idea as of yet.