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Neptune's rings had been observed from Earth many years prior to Voyager 2 's visit, but the close inspection revealed that the ring systems were full circle and intact, and a total of four rings were counted. [4] Voyager 2 discovered six new small moons orbiting Neptune's equatorial plane, dubbed Naiad, Thalassa, Despina, Galatea, Larissa and ...
This criticism was discussed in detail by Danjon (1946) [2] who illustrated with a diagram and discussion that while hypothetical orbits calculated by both Le Verrier and Adams for the new planet were indeed of very different size on the whole from that of the real Neptune (and actually similar to each other), they were both much closer to the ...
Neptune's equatorial radius of 24,764 km [11] is nearly four times that of Earth. Neptune, like Uranus, is an ice giant, a subclass of giant planet, because they are smaller and have higher concentrations of volatiles than Jupiter and Saturn. [73]
The Rare Earth hypothesis argues that planets with complex life, like Earth, are exceptionally rare.. In planetary astronomy and astrobiology, the Rare Earth hypothesis argues that the origin of life and the evolution of biological complexity, such as sexually reproducing, multicellular organisms on Earth, and subsequently human intelligence, required an improbable combination of astrophysical ...
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Nearly nothing was known of Triton's geology until the Voyager 2 spacecraft flew by the Neptune system in 1989, marking the first and only up-close observations of the moon as of 2024. A number of proposals have been made to follow up on Voyager 2 ' s discoveries, such as Trident and Triton Hopper .
Leviathan Patera is a major cryovolcanic caldera on Neptune's largest moon Triton. [3] Discovered by the Voyager 2 spacecraft in 1989, Leviathan Patera is located in Monad Regio and within Cipango Planum's western regions.
Dark spot on Neptune full color (left) and blue light (right) in a 2016 photo. [3] When the spot was to be photographed again in November 1994 by the Hubble Space Telescope, it had disappeared completely, leaving astronomers to believe that it had either been covered up or had vanished. The persistence of companion clouds shows that some former ...