TIME MACHINE
To travel time we need machine that is able to travel with maximum speed required to the gain perfect result. For that we need create vacuum, to gain maximum speed. This vacuum requires specific environment. You may say gravity less environment, to gain maximum speed. Because there are so many factor in normal environments that can affects to time travel.
Like Space-ship , Space can travel with maximum speed in space, rather than on earth. Do you think about it ? Why its become maximum in space ?Because of many environmental factor.
Time machine may be looks a like car, or bus. That can depends on vacuum size.
Now Another part is how can we develop vacuum, we can create underground-tunnel with specific environment or gravity-less environment.
Its about environment , next we will have to focus on material that can be used to build
machine. Like space-ship with same material we can build time machine.
Exception :
If we are able to travel time machine on earth surface then , we have to look after the speed and destruction caused by speed. If any object which is traveling with speed
3 * 10^19 m/s will destruct any object in its path. Because Earth environment is made up
of different elements in vacuum. Simply, Environment means "vacuum which contains different substances, that substances included different elements to create and air and particles in environment.
So any objects that can travel in earth environments with tremendous speed, will bring many elements with it.
Therefore , we have to create specific vacuum for time travel, to avoid interruption and also to avoid speed resistance.