First, it is difficult for a person who does not move in the scientific field of astrophysics, imagine how, from within the Milky Way, you can recreate the figure and structure itself. It is as if from inside an office building, we could understand and recreate the distribution.
However, astrophysicists, with the management they give to the rays of the strip is not visible light, infrared and ultraviolet, can make inferences approximate, not only the object emits light, but the medium flowing through from origin to destination. The example of the building, extrowing, as in the case study of the Milky Way, although we are in, there are no walls that prevent us from seeing the stars that form and the surrounding interstellar medium, which is not completely opaque.
Spitzer Space Telescope has led to the conclusion that our Galaxy has two arms and not four as previously thought. Since the Earth is at one end, inside, it is difficult to recreate or draw as
The theory of the four arms was stellar been impossibleto confirm until now precisely because of the fact that the Earth is inside the Milky Way. Since 1950, astronomers had with models based on observations of galactic cosmic gases, suggesting a spiral structure with four arms of stars, called Norma, Scutum-Centaurus, Sagittarius and Perseus. Our Sun is between Perseus and Sagittarius.
For many years, created maps of the whole galaxy based on studying a section of it or a single method, expressed Some NASA scientists.
devised in the past maps. Unfortunately, when comparing the models developed by various groups, not always coincided. The surveys of the sky at infrared, conducted in the 90's, led to revise previous ideas included the discovery of a large bar of stars in the middle of the Milky Way. Infrared light can penetrate through dust, so telescopes designed to capture this radiation provide better views of our galactic center, dusty and full of stars.
In 2005 astronomers at the University of Wisconsin turned to Spitzer's detectors to obtain information as possible on the galactic bar. They found that through the galactic center extendíaa far beyond what was previously thought.
The team now has new images provided by Spitzer. The target was an area of the Milky Way abarca 130 degrees along the sky and one degree above and below the midplane of the galaxy. This extensive mosaic combines 800,000 snapshots and includes about 110 billion stars.
addition to the comments, the working group developed a software for counting stars and measuring stellar densities. By counting stars in the direction of the Scutum-Centaurus Arm found out that their number increased, as expected in a spiral arm. But when they looked in the direction where they expected to see the Sagittarius and Norma arms found no jump in the number of stars. The fourth arm, Perseus, wraps lthe outer portion of the Milky Way and can not be seen in Spitzer images.
Conclusion
really is difficult to understand how it has been road recreation milk at different stages, before Spitzer and even after this. This recreation has been changing over time, to the extent that greater awareness of the nature of light and built the most modern equipment. I'm not clear on & quamp; eacute; are made and how they are formed, the main arms, like the Orion Spur, which is where today, temporarily, is our solar system.
have to be ready and prepared for future adjustments of the structure of the Milky Way, as we know more the cosmos and better tools to take a view from the outside, which not necessarily be achieved by placing a camera, a project that is almost impossible, but taking advantage of other properties of light, such asreflection.
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