# Time Travel: Via Warm Hole - Part 6

**Time Travel: Via Warm Hole**

In simple mathematics, space is a sheet-like expansion, but in Einstein's 'Theory of Relativity' space-time is bent or 'curved' rather than an extended expansion. Think of it in such a way that if the sheet is of any metal like tin, then it can be folded like tongs in which both the arms of the tongs appear parallel to each other. Actually, this bend or curvature is the geometry of space-time. Newton has given this curvature the name of gravity.

However, in Einstein's twisted space-time, two parallel lines start coming closer to each other. In such a situation, a shortcut can be created between two points on the hands of the bent tongs of space-time, i.e. a point on one arm of the tongs, assuming this point is past. If there is a second point on the other arm, suppose that this point is the future, then a tunnel-like structure becomes a shortcut in the space between the two. Through this tunnel it is possible to travel between points on either arm of the tongs.

The tunnel-like structure has been named a 'warm hole' in relativity, also known as the Einstein-Rosen Bridge. We can consider the future or the past between two points between which travel is possible on different arms from the 'warm hole'. Obviously time travel is possible through 'warm holes' but this is just a theory which is not physically easy.