To fall off the earth

Even without a shooting star 
Walk far enough, slow or fast 
And you'll reach escape precocity 

Out of orbit, unfixable, beyond reach 
It's no longer flight 
When there's no ground 
Electricity mediumless 
Vivrationless sound 

Bound to reflection 
Stiller than light
Tritely, another aphorism, 
But what was uncovered 
The edge of the world