To locate an object in a plane, we require four dimensions — length, breadth, height and time. We all travel frequently in the first three dimensions, but can’t do it in the fourth dimension `time’. Time machine is a device or vehicle that can potentially take us into the future or past and let us stay in that era, just as in fantasy movies. All dimensions have a fixed frame of reference, but we can’t define time. Most scientists believe the ‘Big Bang Theory’ as the origin of time.
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Jayant Vishnu Narlikar — How did the universe, which is composed of stars, galaxies, nebulae, …