Which planet is the furthest from the sun? Some may think it’s Pluto, but it’s actually Neptune. Learn more about this ice ...

A day on Neptune lasts precisely 15 hours, 57 minutes and 59 seconds, according to the first accurate measurement of its rotational period made by University of Arizona planetary scientist Erich ...

NASA's Hubble Space Telescope has been used to assemble a time-lapse color movie showing a full 16-hour rotation of the distant planet, Neptune. The movie, made from a series of Hubble observations ...

The rotation rates of giant planets (Jupiter, Saturn, Uranus, Neptune) are significantly faster than those of terrestrial planets (Mercury, Venus, Earth, Mars). Determining the rotation rates of giant ...

A planet's year length depends on its distance from the Sun. Planets closer to the Sun have shorter years. A planet's rotation speed is unrelated to its year length. Planets' orbital speeds vary ...

SEVERAL circumstances delayed my observation of the planet Neptune this autumn until November 24. On that and the two following nights the light of Neptune was compared with the light of the star ...

Next week, Neptune will complete its first full orbit of the Sun since it was discovered in 1846. The blue planet, the farthest out in the Solar System, remains one of Earth's most mysterious ...

SANTA CRUZ, CA–Neptune’s large moon Triton may have abandoned an earlier partner to arrive in its unusual orbit around Neptune. Triton is unique among all the large moons in the solar system because ...