India's first experimental satellite, Aryabhata, was launched in 1975 into orbit. After completing its operational life, it re-entered Earth's atmosphere in 1992. Which one of the following options best explains why decaying satellites gradually descend and fall to Earth?

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Physics · Gravitation

Verified Solution4 OptionsUpdated: October 2026👁️1 View

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Atmospheric viscous drag forces reduce the speed and mechanical energy of the satellite, causing its orbital altitude to decrease gradually.

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Answer 1

Gravitational forces alone naturally predict a inward spiralling trajectory in pure vacuum.

Answer 2

It happens primarily because of collisions with space debris and other satellites.

Answer 3

Atmospheric viscous drag forces reduce the speed and mechanical energy of the satellite, causing its orbital altitude to decrease gradually.

Answer 4

The batteries and solar cells in satellites run out.

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