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Thu 30 Sep, 2021
Why in news ?
Recently, NASA has launched an earth monitoring satellite called Landsat 9 from Vandenberg Space Force Base in California. The satellite is a joint mission of NASA and the US Geological Survey (USGS).
This satellite is referred to as NASA's' new eye in the sky’ that will help study climate change.
Landsat 9 is the latest and 9th Earth observation satellite in the Landsat series which is a partnership between NASA and the US Geological Survey (USGS).
Landsat 9 will help in continuing the Landsat program of global observation and recording Earth’s land surface.
The first Landsat satellite was launched in 1972.
Landsat 9 will help in expanding our abilities to measures changes across the Earth and its land surface so that decision-makers can make informed management decisions.
It will also help to track crop growth, monitor natural resources on Earth, etc.
An object orbiting around the sun, earth or any other colossal body is known as a satellite
The first Indian Satellite is Aryabhatta. It was launched on April 19th, 1975.
Geostationary Satellite: These satellites are placed into orbit at a distance of around 35,800 km from the earth’s surface. They rotate in the same direction as the earth and one revolution of such satellites is the same as one day on earth.
Polar Satellite: Polar satellites revolve around the earth in a north-south direction around the earth as opposed to east-west like the geostationary satellites.