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(1) A geoid is a hypothetical solid figure whose surface corresponds to mean sea level and its imagined extension under (or over) land areas.
(2) Earth is called aunique planet because earth is the only planet in solar system that have the large amount of water than any other planet.
(3) Only one side of the Moon is visible from Earth because the Moon rotates on its axis at the same rate that the Moon orbits the Earth – a situation known as synchronous rotation, or tidal locking. The Moon is directly illuminated by the Sun, and the cyclically varying viewing conditions cause the lunar phases.
(4) Human satellites are man-made bodies that revolve around the earth. They are used for multiple purposes like communication, weather forecasting, remote sensing, etc. Examples: INSAT, IRS, SPUTNIK-I.
(5) satellites revolve around planets while planets revolve around stars . . satellites can be either natural or artificial but planets are natural celestial bodies. ... as the differ between planets and satellites the force of gravity also differs planets have more force of gravitation in comparison to satellites.
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