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Earth, Moon, • By the time, Earth is the only planet where life exists.…
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• By the time, Earth is the only planet where life exists.
• Earth takes 23 hours, 56 minutes, and 40 seconds to complete its rotation (on its axis) and takes 365.26 days to complete its one revolution (i.e. in its orbit around the Sun).
• Mass of the Earth is 5.98 x 1024 kg and its diameter is 12,756 km.
• Escape Velocity of the Earth is 11,200 m/s.
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• Mean density of the Earth is 5.514 g/cm3 and the surface is 510,072,000 km2.
• Mean surface temperature of the Earth is 281 K; the mean maximum surface temperature is 310 K and the mean minimum surface temperature is 260 K.
• The major atmospheric components of the Earth are Nitrogen (78%), Oxygen (20.95%), Argon (0.930%), and Carbon Dioxide (0.039%).
• Moons rotation time (on its axis) and revolution time (around the Earth) is same (i.e. 27 days, 7 hours, 43 minutes, and 11.47 seconds. This is the reason that we always see only one side of the Moon.
• Moon revolves around the Earth once in every 27.3 days, which is known as ‘Sidereal Month;’ however, it takes 29.5 days to return to the same point on the celestial sphere in reference to the Sun (due to revolution motion of the Earth around the Sun) and it is known as ‘Synodic Month.’
• When two full Moons occur in the same month, it is known as ‘Blue Moon.’
• A Full Moon is basically the lunar phase that occurs when the Moon is completely illuminated as seen from the Earth.
• As shown in the following image, the Lunar Phase or phase of the moon, is the shape of the illuminated portion of the Moon that is visible from the Earth. As Moon revolves, the lunar phases change cyclically and we can see from the full moon (full visible) to the new moon (not at all visible).
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