In the Expanding Universe section, we discovered that at some time in the distant past the universe was much hotter and denser than it is now. To understand why the observable universe is a sphere and exactly how big it is we need to go far back in the history of the universe. How does this relate to the Universe? The shape of the observable universe, the part we can see, is a sphere. R is the distance from the axis of rotation. Where m is the mass of the rotating body, M 1, m 2 are masses which attract each other Pulls inwards and centrifugal force which pulls outwards. The two equations, which mustīalance against each other on every part of the Earth, are gravity which Towards the Earth's Equator which is created by centrifugal force.Īs the Earth spins on its axis, the fastest moving parts, the parts at theĮquator, get pulled out away from the center of the Earth, making the In comparison with the Earth's size, however, these Spherical shape come from the plate tectonics of the Earth which form Some obvious contributions to the imperfections of the Earth's Other forces contribute to the shape of theĮarth. Pull the parts of the Earth together, the net result is that all of theĮarth's matter is pulled into a sphere. Therefore if you add up all of these forces, which
In addition, the force of Gravity is inversely proportional toĭistance 2, which means that the closer two masses are the For this reason,Įvery part of the Earth pulls every other part of the Earth towards Object that has mass towards all the other masses. Gravity can be thought of as a force which pulls every What causes the spherical shape of the Earth? One of the most obviousĬauses affects our daily lives and holds us to the Earth's surface it Role of the radius in an easily understandable situation since thisĬoncept will reappear when we study the curvature of the universe. The radius is the important factor in the circumference, For this reason, we can call it a radius ofĬurvature. TheĮarth's radius is a length that best describes the rate of curvature Radius of the Earth also tells us something about its geometry. In comparison with our everyday lives and how small in comparison with We have been able to successfully measure the circumferenceĪnd therefore the radius of the Earth. Students have difficulty comprehending a space with more than threeĭimensions. Necessary to look to models or approximations to help us understand theĬharacteristics of the universe we live in because many high school Throughout these next few lessons it will sometimes be We began our study of the shape of the universe by studying the shape
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