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.
A line marks the Earth's equator. A line marks the Earth's equator. The equator is defined as an imaginary line drawn on the Earth and spaced equally between the North and South Pole. An example of the equator is the latitude of 0Â°.he imaginary great circle around the earth's surface, equidistant from the poles and perpendicular to the earth's axis of rotation. It divides the earth into the Northern Hemisphere and the Southern Hemisphere. b. A similar great circle drawn on the surface of a celestial body at right angles to the axis of rotation.