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SCIENCE

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Physical - Astronomy

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Largest Planets by Diameter

This list features the largest planets in our solar system by diameter.

RANK

PLANET

DIAMETER

1

Jupiter

142,800 km

2

Saturn

120,660 km

3

Uranus

51,118 km

4

Neptune

49,528 km

5

Earth

12,756 km

6

Venus

12,104 km

7

Mars

6,779 km

8

Mercury

4,849 km


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References

World Atlas (n.d.) What is the largest planet in the solar system? Available at: https://www.worldatlas.com/space/what-is-the-largest-planet-in-the-solar-system.html [Accessed 1 December 2025]. NASA (n.d.) Planet sizes and locations in our solar system. Available at: https://science.nasa.gov/solar-system/planet-sizes-and-locations-in-our-solar-system/ [Accessed 1 December 2025].
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