UNIVERSE
SATELLITESICY BODIES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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They travel in a north-south direction
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They are balanced by Earth’s gravity.
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From Earth, they appear to stand still.
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They can scan the entire globe.
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Detailed explanation-1: -Ans : Over the entire Earth, polar-orbiting satellites provide pictures and air soundings of temperature and moisture data. Geostationary satellites orbit 22, 000 miles above the equator, spin at the same rate as the Earth and focus on the same spot all of the time.
Detailed explanation-2: -Satellites at very high altitudes, which view the same portion of the Earth’s surface at all times have geostationary orbits. These geostationary satellites, at altitudes of approximately 36, 000 kilometres, revolve at speeds which match the rotation of the Earth so they seem stationary, relative to the Earth’s surface.
Detailed explanation-3: -A geostationary satellite is in an orbit that can only be achieved at an altitude very close to 35, 786 km (22, 236 miles) and which keeps the satellite fixed over one longitude at the equator. The satellite appears motionless at a fixed position in the sky to ground observers.
Detailed explanation-4: -Advantages of GEO or Geosynchronous Earth Orbit Hence only 3 satellites are required to cover the entire Earth. ➨Satellites are visible for 24 hours continuously from single fixed location on the Earth. ➨It is ideal for broadcasting and multi-point distribution applications.
Detailed explanation-5: -A satellite maintains its orbit by balancing two factors: its velocity (the speed it takes to travel in a straight line) and the gravitational pull that Earth has on it.