Most of human history has been played out in three dimensions (up-down, front-back and side-side). A little over 100 years ago, the fourth dimension of time was officially added when space was unified with time in the concept of space-time developed by Russo-German mathematician Hermann Minkowski (one of Albert Einstein's university teachers). In 1919, "(Theodor) Kaluza wrote to Einstein, proposing that Einstein's dream of finding a unified theory of gravitation and electromagnetism might be realized if he worked his equations in five-dimensional space-time." "A few years after that, the Swedish physicist Oskar Klein published a quantum version of Kaluza's work." ("Coming of Age in the Milky Way" by Timothy Ferris - The Bodley Head, 1988, p.332) Nowadays, CERN's particle-collider and scientists all over the world are eagerly searching for this 5th dimension which can be called hyperspace. Here's a brief outline of that extra dimension and how it could fulfil the possibilities proposed in the article "Three Totally Mind-bending Implications of a Multidimensional Universe" By David Warmflash - December 4, 2014 (http://blogs.discovermagazine.com/crux/2014/12/04/multidimensional-universe/#.VIKUYmeSzEB). I feel like a kid with a new toy at the moment! At the end of this article is the basis for what future technology might develop into, and simply call, a time machine (it's intended to go into the past as well as the future). This manuscript does seem to have been partly published before because, during its development, I've sometimes reused sentences and paragraphs from previous articles I've written and posted on http://vixra.org/author/rodney_bartlett. This version was submitted, under the title “Gravity, Extra Dimensions, Intergalactic and Time Travel”, to the journal “Foundations of Physics” at the start of the month and is still being considered by its chief editor, Nobel Physics Prize winner Gerardus (Gerard) 't Hooft.