Stephen Hawking was so annoyed at this he formulated his Chronology protection conjecture, which holds that the laws of physics are such as to prevent time travel on all but submicroscopic scales. More technically: the distinction between cause and effect is not made at the most fundamental level within the field of physics. And believe me, they have been looking real hard. The only thing that makes physicists more angry is the fact that there appears to be nothing in physics that forbids time travel. So don't try to use a chronoscanner to see which horse will win at the racetrack or the time-police will show up and beat the snot out of you. This includes time-communicators (allowing one to talk to a person in the past or future) or a time-viewer (allowing one to see events in the past or future). Do remember that it is not just travel that can cause a temporal paradox, any transfer of mere information can be just as bad. And all it takes is one of those bad boys to blow causality right out of the freaking water.

You see, time travel raises the possibility of creating a dreaded temporal paradox. So physicist hate time travel with every existential fiber of their being because time travel can kill causality like a sledge hammer splattering a roach. Step two of the Scientific Method, in fact. Science in general and physics in particular is all about making predictions. Causality mandates that causes must precede effects, or it becomes impossible to make predictions. Probably because without it the entire structure of physics crumbles into flaming ruin and you can't get any work done. Physicists hold exceedingly tight on to the concept of Causality. GURPS Time Travel by Steve Jackson and John Ford.Time Travel: a writers guide to the real science of plausible time travel, by Paul Nahin.The Fourth Dimension: A Guided Tour of the Higher Universes by Rudy Rucker.Geometry, Relativity, and the Fourth Dimension by Rudy Rucker.The Theory and Practice of Time Travel by Larry Niven.This is actually such a huge topic that it deserves its own website. Thirdly one of my favorite atomic rocket science fiction authors when I was growing up was Lady Andre Norton, and she has written some pretty sharp time travel novels. The second reason is that some theories about time travel grow out the fourth dimension.

The main reason this page is here is because if you start messing around with faster than light travel, you are going to be ambushed by time travel sooner or later. These theories-special and general relativity- fundamentally differ from Newton’s because they reveal that neither time nor space is fixed.Yes, Time Travel is not very Atomic Rocket. Today, science accepts that the universe operates according to German-born Jewish theoretical physicist Albert Einstein’s theories of relativity, which recognize that objects’ gravitational forces warp the space and time around them. If space were infinite, and if there were an infinite number of stars, the gravitational force drawing them toward each other would balance out at vast distances, creating a static universe with no central point. Flaws in Newton’s gravitational models became clear when applied to the scale of the universe. Newton’s theories also posited that time is constant and linear. In 1687, English mathematician and astronomer Sir Isaac Newton posited that objects in motion stay in motion, that large and small objects fall at the same rate, and that the solar system is held together by the force known as gravity. Chapter 2 discusses the modern concepts of space and time.

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