A planet is believed to be round because of gravity which pulls equally from all sides. Just like the spokes of a bicycle wheel pulls from the middle, gravity too pulls from the center to the edges. In short, this is what makes celestial objects appear spherical which in fact is a three-dimensional circle.
Unlike stars, planets and moons which can be made of gas, ice or rock, less massive objects such as asteroids, comets and smaller moons seem to have lesser gravity. As a result, they may not pull into perfect spheres.
Our solar system’s eight planets differ a great deal. Firstly, they differ in shape. Then, each one of them has a different distance from the sun. While some are small and rocky, others are quite big and gassy. One similitude that can be drawn among them is that they are all well round.
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It’s not like one is square in shape and the other is a pyramid in shape. It should be noted that planets are formed when materials in the space bump and clump to each other. After a while, there is enough amount of gravity which is a force that pulls together in the space.
It should be underlined that most of the celestial objects rotate on an axis and it has been observed that not all are found to be actually spherical in shape. The rapid rotation flattens out the centre and this is what makes them broader across the equator than from pole to pole.
A very concrete example of this statement is Earth which shape is labeled as an oblate spheroid. Since Jupiter spins more rapidly, it is even more flattened. It is important to know that a day spent on this planet is short 9.9 hours long, thus leaving it an inaccurate imperfect sphere at 71,500 km across the equator and just 66,900 from pole to pole.