NASA Science News nasa asteroid warning asteroid bigger than colosseum to NASA News Science

NASA Science News nasa asteroid warning asteroid bigger than colosseum to NASA News Science
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The "Dagwood Sandwich" Moon. Earlier models of Ganymede's oceans were based on the assumption that the existence of salt didn't change the nature of liquid very much with pressure. However, Dr. Vance and his colleagues found, through laboratory experiments, that salt does increase the density of liquids under the extreme conditions hidden deep within Ganymede and similar icy moons with subsurface bodies of water. Imagine adding table salt to a glass of water. Instead of increasing in volume, the liquid will actually shrink and become denser. The reason for this is that salt ions lure water molecules.



Therefore, the results of the new study support the idea that primitive life could potentially have evolved on Ganymede. This is because places where water and rock interact are important for the development of life. For example, some theories suggest that life arose on our planet within hot, bubbling seafloor vents. Before the new study, Ganymede's rocky seafloor was believed to be coated with ice--not liquid. This would have presented a problem for the evolution of living tidbits. The "Dagwood sandwich" findings, however, indicate something else entirely--the first layer on top of Ganymede's rocky core might be made up of precious, life-sustaining salty water.



Earth's Moon is enchanting; bewitching. The face of the "man"--that some cultures see etched on its brilliant surface--is really composed of the dark areas of the lunar maria (Latin for "seas"), and the lighter highlands of the Moon's surface. Some cultures tell of other examples of strange images seen on the Moon's lovely disk, such as the "Moon Rabbit".

The astronomers found that larger craters, which excavated pits much deeper into the Moon's surface, only increased porosity in the underlying crust. This indicates that these deeper layers have not reached a steady state in porosity, and are not as fractured as the megaregolith.



The new study also found that there was an amazing similarity between the rectangular structures on Earth's Moon, and those encircling the south polar region of Saturn's icy, mysterious moon, Enceladus. The patterns observed on both moons seem to be related to volcanic and tectonic processes operating on their respective moon-worlds.



Indeed, the mixture of nitrogen and methane that whirl around in Titan's swirling thick golden-orange atmosphere create a variety of organic compounds. It has been suggested that the heaviest materials float down to the surface of this hydrocarbon-slashed moon. When these organic compounds tumble down into Titan's lakes and seas--either by raining down from the clouds in alien showers of hydrocarbons, or by traveling along with Titan's strange rivers--some are dissolved in the liquid methane. The compounds that manage to survive this ordeal, and do not dissolve (such as nitrites and benzene), float down to the alien sea floors of this oddball moon-world.

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