Let's ignore the limitations of speed by relativity. At rest on the surface of the Earth we experience an acceleration of one G because of the Earth's mass. Suppose we were in space & we had a space ship that could constantly accelerate at the rate of one G. How fast would we be going after one year?

The upper right picture shows that we would be going a little over one light year/year. Note that when you go at the speed of light for one year, you go a light year. So, after a year we would be going at a little over the speed of light & we would have gone about 1/2 light years.

Is there some secret to the universe hidden in the fact that accelerating at one G for one year gets us going at one times the speed of light?

Another fascinating concept is that we can sit on Earth experiencing one G & go nowhere (relative to that spot on Earth). But, we can experience one G in space & end up moving very fast.