NASA Lunar Tetrad lunar tetrad begins april 15 news bismarcktribunecom Lunar NASA Tetrad

NASA Lunar Tetrad lunar tetrad begins april 15 news bismarcktribunecom Lunar NASA Tetrad

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A little interesting about space life.

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.



and here is another

The ceremonies generally included playing of games, beating of drums, singing, dancing, storytelling, dining and chit chat. The whole community actively took part in the ceremonies. The dances they performed seemed like a huge network of dance groups changing from one array to another every few seconds, following very thoughtfully choreographed rhythmic patterns. This was done very skillfully and with many flourishes. The people were in physical contact with each other during the entire dancing act. Vivid dancing patterns were accompanied by appropriate sound effects. The songs that were sung and the dances that were performed were the same at every city center of the moon where these parties were held. These have not changed over the many thousands of years past, just like the seasonal Christmas songs played on the radio every year.



and finally

Astronomers' current understanding of giant-planet birth predicts an episode of gas accretion that ultimately builds up the enormous size of these gaseous behemoths. According to theory, circumplanetary gas disks, that surround the forming planets during this early period, eventually become the strange nurseries that produce a giant planet's system of moons, thus creating systems of co-planar and prograde (orbiting in the same direction as the planet) natural satellites in a way similar to the many moons of Jupiter and Saturn.

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Pluto itself is a relatively large denizen of the distant Kuiper Belt, that orbits our Sun in the frigid company of a vast multitude of other bewitching and mysterious icy objects. Like other Kuiper Belt Objects (KBOs), Pluto is thought to be composed primarily of ice and rock. It is an intriguing frozen "oddball", a mere 1/6 the mass of Earth's own Moon and 1/3 its volume. Pluto also has a highly inclined, eccentric orbit that carries it from 30 to 49 Astronomical Units (AU) from our Sun. One AU is equal to the mean Earth-Sun separation of 93,000,000 miles. As a result, Pluto periodically moves towards our Sun at a distance that is closer to our Star than Neptune. Very fortunately for both Neptune and Pluto, an orbital resonance with Neptune prevents the duo from crashing into each other.



Triton and Pluto share roughly the same bulk composition and density, as well as similar atmospheres. In addition, both remote bodies move in unusual orbits. Pluto has a highly eccentric orbit, and is sometimes closer to the Sun than Neptune! Furthermore, Pluto orbits in the opposite direction around our Sun than do the eight major planets of our Solar System. Triton revolves around Neptune in a direction counter to that of its planet--and its retrograde orbit indicates that it is a captured object. Because of the unusual nature of both Triton's and Pluto's orbits, as well as the similarities of their bulk properties and atmospheres, it has long been thought that there is some sort of historical connection between them. Indeed, it was once thought that Pluto was an escaped moon of Neptune, but this is now considered unlikely. It is much more likely that long ago Triton, like Pluto, circled the Sun independently, but was unluckily captured by its adoptive planet--whereas Pluto was left to wander freely.



As for Triton--it's a doomed world. It circles around its parent planet in the wrong direction, and as it does so it moves ever closer and closer inward. Eventually, Triton will crash into Neptune!