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Hace 2 días · Neptune, third most massive planet of the solar system and the eighth and outermost planet from the Sun. Because of its great distance from Earth, it cannot be seen with the unaided eye. With a small telescope, it appears as a tiny, faint blue-green disk. It is designated by the symbol ♆.
Hace 2 días · Bibliography. Literature. External links. Neptunium is a chemical element; it has symbol Np and atomic number 93. A radioactive actinide metal, neptunium is the first transuranic element. It is named after Neptune, the planet beyond Uranus in the Solar System, which uranium is named after.
Hace 5 días · Neptune. Earth. Neptune is 3.9x larger than Earth. DATE OF DISCOVERY. 23 September 1846. Unknown. DISCOVERED BY. Urbain Le Verrier, John Couch Adams, Johann Galle. Known by the Ancients. AVERAGE ORBIT DISTANCE. 2,795,173,960 miles. 92,956,050 miles. MEAN ORBIT VELOCITY. 12,158 mph. 66,622 mph. ORBIT ECCENTRICITY. 0.00859048. 0.01671123.
Hace 1 día · Galileo observed the planet Neptune in 1612. It appears in his notebooks as one of many unremarkable dim stars. He did not realise that it was a planet, but he did note its motion relative to the stars before losing track of it. Sunspots. Galileo made naked-eye and telescopic studies of sunspots.
Hace 2 días · Neptune is an ice giant planet, primarily composed of water, methane, and ammonia, and has a deep, turbulent atmosphere with strong winds and large storms, including the famous Great Dark Spot and the smaller Dark Spot. The planet has a day length of approximately 16.1 Earth hours and an orbital period of 165 Earth years.
Hace 16 horas · Pluto ( minor-planet designation: 134340 Pluto) is a dwarf planet in the Kuiper belt, a ring of bodies beyond the orbit of Neptune. It is the ninth-largest and tenth-most- massive known object to directly orbit the Sun. It is the largest known trans-Neptunian object by volume, by a small margin, but is less massive than Eris.
Hace 4 días · Last week, the 9/11 Memorial & Museum marked the 10-year anniversary of the raid on Osama bin Laden’s compound with Robert M. Gates, former secretary of defense, and Leon E. Panetta, former director of the CIA. In conversation with Clifford Chanin, executive vice president and deputy director for museum programs, Gates and Secretary Panetta ...
