With an orbital period of 164.8 years, Neptune has not yet completed its first full orbit since discovery. ... The size, mass, composition and rotation of Uranus and Neptune are in fact so similar that they are often called planetary twins. These parameters lie between those of the Earth and the giants Jupiter and Saturn.
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With an orbital period of 164.8 years, Neptune has not yet completed its first full orbit since discovery. ... The size, mass, composition and rotation of Uranus and Neptune are in fact so similar that they are often called planetary twins. These parameters lie between those of the Earth and the giants Jupiter and Saturn.
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