Ptolemaic Solar System ptolemaic system astronomy britannicacom Ptolemaic System Solar

Ptolemaic Solar System ptolemaic system astronomy britannicacom Ptolemaic System Solar

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A little interesting about space life.

Last night there was a full moon. One of my dogs was very on edge, starting at every sound, staring out into the darkness at something I could neither hear nor see. The other 4 dogs were sound asleep. Did she sense something different about the moonlit night?

and here is another

For most of the 20th century, astronomers thought that Pluto was a lonely little world, a solitary ball of ice circling our Sun, so very far from the comforting warmth and delightful light of our brilliant Star. However, in 1992, the discovery of the first KBO (other than Pluto), made astronomers come to the realization that Pluto is not far from the madding crowd of a vast population of other Kuiper Belt ice balls.

and finally

Jupiter, the largest planet in our Solar System, also has the largest moon--Ganymede. A large number of Jovian moons sport highly elliptical orbits and also circle backwards--that is, opposite to the spin of their planet. Saturn, Uranus, and Neptune also sport such so-called irregular moons, that orbit far from their respective parent planets.

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In their research, the planetary scientists combined several radar observations of heat given off by Ligeia Mare. They also studied data collected from a 2013 experiment that bounced radio signals off Ligeia Mare. The results of that experiment were presented in a 2014 paper led by Cassini radar team associate Dr. Marco Mastroguiseppe of Cornell University in Ithaca, New York, who also was part of the new study.

The research published in the July 4, 2016 issue of Nature Geoscience highlights the main factor differentiating moon-birth around Mars and Earth: the differing rotation speeds of the two planets prompted "completely different tidal actions," Dr. Charnoz explained in the July 4, 2016 CNRS Press Release. Dr. Charnoz proposes that at the time of their respective impacts, "Earth took less than four hours to spin on its axis whereas Mars rotated very slowly over a 24-hour period." The result of this important difference caused Earth to hold on to its single, large Moon, while the Martian collision created a dozen smaller moons alongside a larger moon. As time went by, Martian tidal action--resulting from the planet's slow rotation rate--caused most of the moons, including the largest one, to crash back down to the surface of their parent-planet. As a result, only the two most distant moons, Phobos and Deimos, survived as testimony to the ancient catastrophe.

A moon is a natural body that is in orbit around another body that circles our Sun. The moon is kept in its orbit by its host's gravity, as well as by the gravity of the moon itself. Some planets host moons; some do not. Some asteroids have moons, and some dwarf planets--such as Pluto--are also circled by moons.