Ptolemaic Solar System what is the ptolemaic model of the solar system quora Ptolemaic System Solar

Ptolemaic Solar System what is the ptolemaic model of the solar system quora Ptolemaic System Solar

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A little interesting about space life.

In this fascinating new research, the astronomers announced that they have discovered that a duo of Pluto's moons, dubbed Nix and Hydra, are actually in a chaotic rotation. This basically means that an observer standing on the alien surface of icy, strange Pluto, would not observe the same face of its moons from one night to the next. For those observers visiting the two bizarre moons themselves, things would be even weirder because every day would be a different length from the one that came before it.



and here is another

The HST images also showed that the moon Kerberos is charcoal black in color, which is in stark contrast to the brilliant white of the other moons of Pluto. It was predicted that dust blasted off the moons by meteorite impacts would blanket the moons, giving them a homogeneous appearance. However, the reason why Kerberos is black remains a mystery.



and finally

Like Earth's own large Moon, Triton is locked in synchronous rotation with its planet--one side always faces Neptune. However, because of Neptune's odd orbital inclination, both of the moon's polar regions take turns facing the Sun. Spacecraft images of Triton reveal mounds and round pits formed from icy lava flows (cryovolanism), as well as smooth volcanic plains. The surface of the moon is only sparsely cratered, indicating that its surface is new--that is, it is constantly being resurfaced, probably by the "lava" flow from icy volcanoes. Triton is very bright--its fresh, sparkling, new ice-coating is believed to cover a heart of metal and rock. Triton's high density suggests that it contains more rock in its interior than the icy moons of Saturn and Uranus.

More information:

Astronomers suspected for a very long time that Triton was not born a moon of Neptune, but was instead a luckless refugee from elsewhere that had been kidnapped by its planet. It was not until 2006, however, that a convincing theory explaining how Triton was ensnared by its adoptive parent was proposed. This theory suggests that Triton once had a companion as it orbited the Sun. According to this scenario, Neptune's strong gravitational embrace tugged Triton away from its sister world. This research was reported in the May 11, 2006 issue of the journal Nature.



"We've found a likely solution to the long-standing problem of how Triton arrived in its peculiar orbit. In addition, this mechanism introduces a new pathway for the capture of satellites by planets that may be relevant to other objects in the Solar System," explained Dr. Craig Agnor, a researcher from the University of California, Santa Cruz, in the May 10, 2006 issue of Time Magazine.



For a long time, planetary scientists thought that in the aftermath of the Moon-forming collision, hydrogen dissociated from water molecules. According to this scenario, both water and other elements that have low boiling temperatures (volatile elements), escaped from the disk and were lost forever to space. This model would form a volatile-element-depleted and bone-dry Moon. At the time, this scenario seemed to be consistent with earlier analyses of lunar samples.