If you removed all the DNA helices in the average human body and stretched them out end-to-end they would extend from planet Earth past the planet Pluto.
Reason: Every cell in your body contains a double helix of your unique DNA, each one, when extended to its full length measures about 6.5 ft. There is about 36 trillion cells in the human body.
The DNA double helix is a real physical thing within your cells