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.
1 a real or imaginary straight line on which an object rotates or is regarded as rotating: the axis of a planet. 2  a real or imaginary straight line around which the parts of a thing, system, etc. are symmetrically or evenly arranged or composed: the axis of a picture. 3  a main line of motion, development, etc.