Write 10-12 lines on the importance of artificial satellites.
Answers
Answer:
Low Earth orbit (LEO) – from 200 to 2,000 km, for example, the ISS orbits at 400 km with a speed of 28,000 km/hour, and time for one orbit is about 90 minutes.
Medium Earth orbit (MEO) – most MEO satellites are at an altitude of 20,000 km, and time for one orbit is 12 hours.
Geostationary orbit (GEO) – 36,000 km above the Earth. Time for one orbit is 24 hours. This is to match the rotation of the Earth so that the satellite appears to stay above the same point above the Earth’s surface. This is used for many communications and weather satellites.
The altitude chosen for a satellite depends on the job it is designed for.
Types of satellites
Navigation satellites
The GPS (global positioning system) is made up of 24 satellites that orbit at an altitude of 20,000 km above the surface of the Earth. The difference in time for signals received from four satellites is used to calculate the exact location of a GPS receiver on Earth.
Communication satellites
These are used for television, phone or internet transmissions, for example, the Optus D1 satellite is in a geostationary orbit above the equator and has a coverage footprint to provide signals to all of Australia and New Zealand.
Answer:
Explanation:
Artificial satellites can be used for: Earth observation - including weather forecasting, tracking storms and pollution, spying and satellite photography; navigation - including the Global Positioning System (GPS); astronomy – looking into outer space from our solar system.