PlanetA planet, commonly called a world, was a type of celestial body in orbit around one star[2] or multiple.[3] A system of planets orbiting a star could, under the correct conditions, be formed when drifting clouds of gas and dust beyond the star itself clumped together.[4] Many scientists stated that a planet had to be large enough for its gravity to have 'cleared its orbit' by attracting all the smaller bodies in its immediate neighborhood, excluding its own satellites, known as moons...
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The Purple Earth..The Purple Earth hypothesis is an astrobiological hypothesis that photosynthetic life forms of early Earth were retinal-based rather than chlorophyll-based, making Earth appear purple rather than green.