2000 Em 26 Asteroid Trajectory 2000 em26 il primo di tre asteroidi che passeranno vicino Asteroid Em Trajectory 2000 26
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Voyager 2 flew by Neptune back in 1989, and its observations revealed a number of active geysers, situated within the polar cap heated by the Sun. The geysers hurl out plumes to the impressive height of up to 8 kilometers. Triton has a relatively high density that indicates rocks account for approximately two-thirds of its mass, and ices (mostly water ice) compose the remaining one-third.
and here is another
Only after Triton's orbit became circular, around its adopted parent-planet, could some of the rubble re-accrete to form the moons of Neptune that astronomers observe today. Triton's highly disruptive invasion of the Neptune system may be the reason why the moons of Neptune do not conform to the 10,000:1 ratio of mass between parent-planet and moon-offspring that literally all of the moons observed in the satellite systems of the other giant planets in our Solar System conform to.
Discovering the water content of volcanic deposits on our Moon using orbital instruments presents quite a challenge. Planetary scientists use orbital spectrometers to measure the light that skips off of a planetary surface. By determining which electromagnetic wavelengths of light are reflected or absorbed by the surface, the scientists can then get an idea of which minerals and other compounds are present.
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In the fourth century BCE, Aristotle recorded that Mars vanished behind Earth's Moon during an occultation. This suggested that the planet was farther away than our Moon. The Greek astronomer, Ptolemy, who lived in Alexandria, attempted to solve the problem of the orbital motion of the Red Planet. Ptolemy's collective works and model on astronomy was presented in his multi-volume collection, titled the Almagest. The Almagest became the authoritative work on Western astronomy for the next 400 years. Ancient Chinese astronomers were also aware of the existence of Mars by no later than the fourth century BCE. In the fifth century CE, the Indian astronomical work titled Surya Siddhanta proposed a measurement of the estimated diameter of Mars. In East Asian cultures, Mars is usually referred to as the "fire star"--based on the Five Elements: fire, wood, metal, water, and earth.
Two French astrophysicists, proposing the new, alternative scenario explaining moon-birth, reported their findings in a paper titled: Formation of Regular Satellites from Ancient Massive Rings in the Solar System, published in the November 30, 2012 issue of the journal Science. Dr. Aurelien Crida, an astrophysicist at the University of Nice--Sophia Antipolis and the Observatory of Cote d'Azur in France, explained in the November 29, 2012 issue of Scientific American that "It's fundamentally the same process that gave birth to the Moon and to the satellites of the giant planets, and that's the spreading of rings." Dr. Crida is a co-author of the study with Dr. Sebastien Charnoz of the University of Paris--Diderot.
According to this theory, the Saturn system began with a family of several relatively large moons, analogous to the four large Galilean moons of Jupiter--Io, Europa, Ganymede, and Callisto. However, strange and violent things happened in the Saturn system that drove its large moons onto a collision course with destiny. According to the theory, there were a few dramatic moon mergers, forming the Titan that we now know--but there was also a sufficiently large quantity of moon-stuff left over from the collisions to create the icy mid-sized satellites--Mimas, Iapetus, Enceladus, Tethys, Dione, and Rhea!