Hydrogen is by far the most abundant element in the universe. It makes up about 93 percent of all atoms in the universe and about three-quarters of the total mass of the universe. Hydrogen occurs both within stars and in the interstellar space (the space between stars).
It is an imaginary line from the Earth's north pole to its south pole, passing through the center of the Earth. Imaginary in the sense that it is not marked in any way; howeve â¦ r, Earth rotates around this axis.
1540s, imaginary straight line around which a body (such as the Earth) rotates, from Latin axis axle, pivot, axis of the earth or sky, from PIE *aks- axis (cf. Old English eax, Old High German ahsa axle; Greek axon axis, axle, wagon; Sanskrit aksah an axle, axis, beam of a balance; Lithuanian aszis axle).