Space - Vastness and Beyond (and time travel)

Falcon heavy. 

When we think about space, we seem to be enchanted by its expanse. It is something big beyond imagination and filled with mysterious that we can not begin to unravel. 

How did the universe being? 
What is at the edge of the universe?
Can we travel to another galaxy? 

Falcon Heavy is a mere rocket. It is a big rocket, but it is trivial compared to the size of our universe. 

Picture by me from Pixel 2 XL.

Insatiable. 

It is pretty clear that human desire is insatiable. The best examples are ourselves. We wish for goals, we give up on them, we reach them, and we set other goals. Last week, I talked about the unreacheable state of complete satisfaction. Insatiable desire is merely another way of saying it. 

Falcon Heavy's launch brought me back to this topic. Elon Musk said something along the lines of wanting to make humans an interplanetary species. Everyone can share the primal human awe and desire to explore the universe, the unknown full of potential. We are, after all, insatiable. 

Dimensions. 

Through my ponderings of space and time, I thought of the dimension theory. 

There are infinitely many 0 dimension objects (points) in 1 dimension space (line).
There are infinitely many 1 dimension objects (lines) in 2 dimension space (plane). 
There are infinitely many 2 dimension objects (planes) in 3 dimension space (volume). 
There are infinitely many 3 dimension objects (volumes, or our universe) in 4 dimension space (universe timeline).

And so on. 

It is impossible to jump across a higher dimension with forces in the lower dimension. This means that it is impossible to time travel with 3 dimensional forces (up, down, left, right...). To effectively time travel backwards and forwards in time, we need a force from the 4th dimension itself. 

Think about cartoon characters on a movie screen. They are limited to move within the 2D screen, and we can only make them 3D by using our hands to interact with the screen or construct them or move them in our 3D space. Potentially, 4D capable entities can displace us across time. 

If 4th dimension is linear time, then 5th dimension is needed for worldline jumping. 

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