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- There are myriad astronomical bodies that revolve around stars. Some of them are asteroids and comets, yet others are even smaller cosmic bodies. But any heavenly body that revolved around a particular star, cannot be considered as a planet. In order to be ‘deemed fit’ to be a plant, a heavenly body needs to be heavy enough to be rounded by its own gravity. Just like response time is important for gaming monitors, gravity is important for planets too!
- But again, there is an upper limit in this regard as well. This means that there is a certain ‘heaviness limit’ till a planet can be considered as a planet. If it is any heavier or bigger, it will automatically trigger thermonuclear fusion by virtue of its mass or size, and hence will cease to be a stable celestial body that can be termed as a planet. On a lighter note, this might be a good time to thank your stars for the balanced ‘mass-volume’ proportion of planet earth, upon which we so gleefully thrive as a species. Had it been any larger or heavier, we wouldn’t have experienced all the joys, sorrows and experiences of life here!
- There are many widely speculated as well as scientifically backed theories to explain the origin of planets, but the most well-accepted and simple process within the scientific community is the collision and sticking together of cosmic dust, which leads to the gradual accumulation of mass and volume, thereby forming a planet-like structure over several centuries or millennia. In this aspect, the phenomenon known as Brownian Motion is also equally useful to understand how planets form, revolve, rotate and maintain inner stability.