7 hours.
If we stretch the DNA strand in a human cell, it can reach about 6 feet in length. Since the Earth's circumference is about 24,901 miles, a single DNA strand from a human cell could circle the Earth around 7,412,320 times.
Any great circle (the best known great circle is the equator) which are about 24,901 miles long.
About 523 Earth years.
365 days
It would take about a month.
The space shuttle took approximately 90 minutes to circle the Earth in low Earth orbit at a speed of about 17,500 miles per hour.
Saturn does not circle the earth. It orbits the sun. Copernicus demonstrated this mathematically in the 17th century. It takes about 29 earth years for Saturn to complete one orbit of the sun.
Deimos orbits Mars, not the Earth, and takes 1.26 days to do so.
No. The circumference is always (pi) times as long as the diameter. If it isn't, then whatever shape you're looking at is not a circle.
No. A circle is 2-dimensional. The Earth is a sphere. no actualy, it is a sphere, but a long time ago, historians thought that the world was a flat circle
About an hour.
Lines of latitude horizontally circle the Earth.