Are All a Scale of Planets a simple way to remember the order of the planets Planets a Scale of Are All

Are All a Scale of Planets a simple way to remember the order of the planets Planets a Scale of Are All

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Interesting facts about space.

"Prior to the Hubble observations, nobody appreciated the intricate dynamics of the Pluto system," Dr. Mark Showalter explained in a June 3, 2015 HST Press Release. Dr. Showalter is of the Search for Extraterrestrial Intelligence (SETI) Institute in Mountain View, California. He is lead author of the Nature paper.

and here is another

Pluto has a tenuous atmosphere composed of nitrogen, methane, and extremely toxic carbon monoxide, which probably originates from the ice on its frigid surface. As Pluto wanders in its orbit ever closer and closer to our Sun, it becomes increasingly warmer and warmer. The ice on its strange surface evaporates as a result, and the gases flow into interplanetary space. This continues until Pluto starts to travel away from the Sun again, becoming increasingly colder and colder as it does so. Pluto's bizarre atmosphere again freezes, and then floats down to its very alien surface as snow--but it will evaporate again when Pluto begins its long journey back towards our Sun. It takes 248 years for the frozen dwarf planet to complete a single orbit around our Sun.

and finally

Saturn, along with its frozen retinue of icy rings, dazzling moons, and sparkling moonlets, orbits our Sun about ten times farther out than the Earth. Astronomers received their first collection of detailed data about Titan when the Cassini/Huygens orbiter and lander arrived there in 2004. The Huygens lander successfully obtained revealing images when it drifted down to Titan's tormented, hydrocarbon-slashed surface, as well as when it was still floating slowly and softly down through the moon's thick, foggy, orange atmosphere--which has 1.4 times greater pressure than that of our own planet. These pictures, when combined with other studies using instruments aboard the Cassini orbiter, reveal to curious planetary scientists that Titan's geological features include lakes and river channels filled with methane, ethane, and propane. Titan's strange surface also shows mountains and sand dunes--and it is pockmarked by craters. The rippling dunes form when fierce winds sweep up loose particles from the surface and then tosses them downwind. However, the sands of Titan are not like the sands on our Earth. Titan's "sand" is both bizarre and alien, probably composed of very small particles of solid hydrocarbons--or, possibly, ice imprisoned within hydrocarbons--with a density of about one-third that of the sand on our own planet. Furthermore, Titan's gravity is low. In fact, it is only approximately one-seventh that of Earth. This means that, working in combination with the low density of Titan's sand particles, they carry only the small weight of a mere four percent that of terrestrial sand. Titan's "sand" is about the same light-weight as freeze-dried grains of coffee!

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There are several potential explanations that could account for the sea's composition of pure methane, Dr. Le Gall added. "Either Ligeia Mare is replenished by fresh methane rainfall, or something is removing ethane from it. It is possible that the ethane ends up in the undersea crust, or that it somehow flows into the adjacent sea, Kraken Mare, but that will require further investigation," she noted.

The scientists then went on to determine that the lunar birthday must have occurred approximately 95 million years after the formation of our Solar System--give or take about 32 million years.

The moon-mergers may have happened very long ago--or maybe quite recently. The mergers could have been tripped off by gravitational disruption caused by a migrating giant planet such as Uranus or Neptune, the researchers told the press in October 2012.