A sphere (from Greek ÏÏÎ±á¿ÏÎ± â sphaira, "globe, ball") is a perfectly round geometrical and circular object in three-dimensional space, such as the shape of a round ball. Like a circle, which, in geometrical contexts, is in two dimensions, a sphere is the set of points which are all the same distance r from a given point in space. This distance r is known as the radius of the sphere, and the given point is known as the center of the sphere. The maximum straight distance through the sphere is known as the diameter. It passes through the center and is thus twice the radius.
The sun has been extensively studied by astronomers for the last 50 years. While previous research suggested that the the sun is slightly sun bulged a bit around the middle , making it very slightly flying-saucer shaped, new measurements however taken by a satellite suggest that its shape is the closest to that of a perfect [...]
Using the RHESSI spacecraft, scientists managed to calculate the Sun’s roundness with a level of precision that surpasses anything of this type that has been attempted before. They found that the star which the Eart rotates around is not quite a sphere, but it has a thin “cantaloupe skin”. This skin causes the equatorial radius [...]