Are All a Scale of Planets the planets in our solar system in order of size of All Planets a Are Scale
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Interesting facts about space.
Our third theory to discuss is the "Co-Formation Theory" which alleges that the Moon and Earth were formed within the nebular disk around the Earth (similar to how our solar system formed around the Sun). This theory falls short when one revisits the composition of the Earth and Moon. If the Moon did indeed share some of the same building material as the Earth did and form in the same area, it should be very similar in composition to the Earth. We've seen, however, that the Moon doesn't share a significant iron core like our home planet does. There is one theory which remains to be discussed, and it is the one that is widely accepted today. The Giant Impactor Theory: The Giant Impactor Theory claims that the Moon was formed when an object the size of Mars slammed into the Earth shortly after the solar system's formation. After this object hit the Earth, tons of material from both the object and the Earth were sent into space and began to orbit around the Earth. This material slowly began to come together and collide until what we see as our Moon was created. This theory most easily explains the criteria we previously mentioned. The heat that would have been generated after the collision explains the evidence of "baking" on the Moon's surface. It also supports the fact that the Moon doesn't have a large iron core like the Earth. Finally, we have seen evidence of other such collisions in other parts of the solar system.
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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!
"For decades scientists have thought Jupiter's moon Europa was a likely place for life, but now we have specific, exciting regions on the icy moon to focus our future studies, " Dr. Don Blankenship, senior research scientist at the University of Texas at Austin's Institute for Geophysics, commented in the November 16, 2011 National Geographic News.
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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.
Planetary scientists usually calculate the Moon's age by using the radioactive decay of elements like uranium, explained Dr. John Chambers in the April 2, 2014 National Geographic News. Dr. Chambers is a planetary scientist at the Carnegie Institution for Science in Washington, D.C. By studying an element with a recognized decay rate, and knowing its concentration in Moon rocks or the Earth's surface, scientists are able to calculate back in time to when the material first formed. However, there are numerous and varying radioactive materials that can provide differing timelines, added Dr. Chambers, who was not involved in the study.
Several theories have been around for a long time that have attempted to explain how Earth's Moon was born. The first theory suggests that the Moon was once part of Earth, and that it somehow budded off about 4.5 billion years ago. According to this theory, the Pacific Ocean basin is the most likely site for where this occurred. A second theory postulates that the interaction of Sun-orbiting and Earth-orbiting planetesimals (the ancient building-blocks of planets), in the early years of our Solar System, caused them to disintegrate. Earth's Moon then coalesced out of the shattered debris of the pulverized planetesimals. A third theory proposes that the Earth and Moon were born together out of the original nebula that gave rise to our Solar System, and a fourth theory suggests that the Moon was really born somewhere else in our Solar System, and was ultimately captured by Earth's gravity when it traveled too close.