Earth is the largest of the four rocky planets and the only world known to host life. Liquid water has covered most of its surface for billions of years, shaping both its geology and its atmosphere.
Scale Comparison
Neptune is about 3.9 times Earth's diameter, only slightly smaller than Uranus despite their different appearances.
Neptune is an ice giant rather than a rocky world. Its visible “surface” is a cloud layer in a deep atmosphere, so its quoted diameter is measured at a reference pressure level.
Objects
Object details and sources
Neptune is the farthest planet from the Sun. Its winds are the fastest measured in the Solar System, driving methane clouds at more than 2,000 kilometers per hour.
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About
Scale of Space is a scroll-based journey through the universe, placing objects on a single logarithmic scale so you can compare size across an unbroken range.
Guides explain selected parts of that range, while focused views filter the objects by subject.