Which one of the following planets has the highest density?

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Mercury

Venus

Jupiter

Earth

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This question was previously asked in

UPSC NDA-1 – 2021

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The correct answer is Earth.

Density is defined as mass per unit volume. The density of planets varies based on their composition. Terrestrial planets (Mercury, Venus, Earth, Mars) are primarily composed of rock and metal, making them relatively dense. Gas giants (Jupiter, Saturn, Uranus, Neptune) are primarily composed of lighter elements like hydrogen and helium, resulting in much lower densities. Among the options provided, Earth is a terrestrial planet and has the highest average density (approximately 5.51 g/cm³).

Comparing the densities of the given options:
– Earth: ~5.51 g/cm³
– Mercury: ~5.43 g/cm³
– Venus: ~5.24 g/cm³
– Jupiter: ~1.33 g/cm³
Earth has the highest density among these four planets, and indeed, it has the highest density among all planets in our solar system.

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