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This is an image of Pluto compared with that of the Earth.
Image from: NASA

A Comparison of Pluto and the Earth.

This is an image of Pluto compared with that of the Earth. Pluto, the outermost planet in the solar system, is the smallest planet in the solar system, much smaller than Earth, and probably made of ice. The table below gives a comparison of features of Pluto as compared to the Earth.

Characteristic Relative to Earth
(Earth = 1)
Absolute Value
Mass 0.0022 1.29x10**25
Radius 0.18 1,150 km (?)
Average Density ----- 2 g/cm**3 (?)
Rotation Period 6.8 Earth days -----
Average Orbital
Distance
39 AU 5,9130 x 10**9 km
3 billion miles
Orbital Period 248 Earth years -----
Orbital eccentricity ----- 0.248
Inclination to
ecliptic (degrees)
----- 17.14
Temperature ----- -350F

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Pluto

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Windows to the Universe, a project of the National Earth Science Teachers Association, is sponsored in part by the National Science Foundation and NASA, our Founding Partners (the American Geophysical Union and American Geosciences Institute) as well as through Institutional, Contributing, and Affiliate Partners, individual memberships and generous donors. Thank you for your support! NASA AGU AGI NSF