Human DNA covers 67 times larger than distance between the sun to Earth putting them end to end

  DNA: (DNA) is a molecule that carries the genetic instructions used in the growth, development,functioning and reproduction of all known living organisms and many viruses.DNA is a long polymer made from repeating units called nucleotides. The structure of DNA is non-static, all species comprises two helical chains each coiled round the same axis, and each with a pitch of 34 ångströms (3.4 nanometres) and a radius of 10 Angströms (1.0 nanometre). According to another study, when measured in a particular solution, the DNA chain measured 22 to 26 ångströms wide (2.2 to 2.6 nanometres), and one nucleotide unit measured 3.3 Å (0.33 nm) long.[Although each individual repeating unit is very small, DNA polymers can be very large molecules containing millions of nucleotides. For instance, the DNA in the largest human chromosome, chromosome number 1, consists of approximately 220 million base pairs and would be 85 mm long if straighten.

Though length and size of DNA is very small, total length of all DNA placing them end to end is 17 times larger than the distance between Pluto and Sun. It gives the 66.8458135 round trips to the sun.

The human genome, the genetic code in each human cell, contains 23 DNA molecules each containing from 500 thousand to 2.5 million nucleotide pairs. DNA molecules of this size are 1.7 to 8.5 cm long when uncoiled, or about 5 cm on average. There are about 37 trillion cells in the human body and if you’d uncoil all of the DNA encased in each cell and put them end to end, then these would sum to a total length of 2×1014 meters or enough for 17 Pluto roundtrips (1.2×1013 meters/Pluto round trip).  

The total length of DNA present in one adult human is calculated by the multiplication of

(length of 1 bp)(number of bp per cell)(number of cells in the body)

=(0.34 × 10-9 m)(6 × 109)(1013)

2.0 × 10¹³ meters

That is the equivalent of nearly 70 trips from the earth to the sun and back.

2.0 × 10¹³ meters = 133.691627 astronomical unit

133.691627 / 2 = 66.8458135 round trips to the sun

                          =17 Pluto roundtrips ( as 1.2×10¹³ meters/Pluto round trip).  

Refference:

1.http://hypertextbook.com/facts/1998/StevenChen.shtml

2. Wikipedia.org

3.Image credit: bbc.co.uk