You hold a tiny grain of sand
And take out all the atoms
Can you imagine an emptier place
A tiny piece of empty space?
Each atom gone is not enough
Evacuated all the stuff
We even took out all the air
Could it be simpler, nothing there?
But wait – inside there’s gravity
We couldn’t simply take that out
But let it fall and float in space
Perhaps it’s now an empty place.
If enclosed in a tiny shell
It’s dark inside, no light comes in
But unless cold as ice it’s said
The walls glow warm in infrared.
Now cool it down so microwaves
With longer wavelengths can’t fit in
Magnetic fields can be removed
At least our vacuum has improved.
Are we there yet? Not quite, no
The Higgs field – space is full of it
Dark energy is also there.
We think that must be everywhere.
Reality is more complex
As Heisenberg explained
Proved energy can fluctuate
Then vanishes if you look too late.
All matter virtually exists
In little loops and frothy things
A short exposure’s just a flicker
More energy’s there if you look quicker.
Shorten the time in which you look
Top quarks and W and Zee
More particles come into play
Space more complex than we can say.
At last we reach Planck space and time
Down there are frothy strings and loops
What started with simplicity
Evolved into complexity.
All physics in that grain of sand.