Answer:
I am a shimmering field that reaches far. Yet I have no tracks and am crossed without paths.
My geometry is lost in the night to be found in daylight's break. The rigors of time have torn me to shreds, yet I stand to protect that which lies within. What am I?
I am heavy forward but backward I'm not.
Physicists have built devices to move me very fast. My last seven letters can be commonly found in newspapers magazines and journals.
You write on me and secrets I can keep in places never seen. I spin like a top. Though stiff as a board, I'm often described like a mop. What am I?
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.