Astronomers find fossil stars from the beginning of the galaxy

In an article published on, called “Astronomers find fossil stars from the beginning of the galaxy” by Liz Krusei perfectly settles in with our eighth conceptual objective on how astronomers determine the luminosity, the temperature and size of stars. To begin, the article talks about about a celestial object located in at the brink of the center of our galaxy called Terzan 5. Furthermore, the article tells us this celestial objects hosts two very different population of stars that were created at very two different time periods. In order, for scientists to measure these stars they had to use an instrument called Color-Magnitude diagram. Then the article persists they used this tool to gather information about the star’s luminosity and compared them to their star’s colors. Next, the article explains that because of a stars particular color is also pertains to the stars temperature, and then the temperature is determined by the mass of the star. Diving, deeper in the article the author tells us that they can compare each recorded temperature and brightness toward the general idea of the characteristics of each star to figure out how old these stars actually are. Lastly, the article goes into depth describing how old these stars are and how big they have gotten over the billions of years that have passed since they were created.

This article fits perfectly on what we learned in class because there are three major properties that we use to determine information based on stars this is the luminosity of the star, the mass, and the stars temperature. We learned this through several lectured-tutorials, notes, and I-clicker questions. Specifically, in a lectured-tutorial called “Luminosity, Temperature, and Size,” we learned that  luminosity is the rate of energy that is given off by the star. In order, for the star to have a much larger luminosity the star must have a higher temperature or have a giant and long surface area. We did this in the lectured-tutorial by comparing hot plates and to determine which hot plate would heat up a bowl of spaghetti faster compared toward the other ones. To get a better understanding based on the hot plates they asked questions switching the properties of the hot plates like if the two hot plates were the same size can you assume that the hot plate can cook a pot of spaghetti at a much higher temperature. To conclude, from this tutorial we can take this idea of how the luminosity correlates with the temperature of the star and the size of the star due, to its surface area. This is exactly how in the article the astronomers were able to figure out a ton of information about these stars characteristics. Also, in the article they were able to compare these recordings to determine the age of these star’s as well.

Honestly, this was probably one of the most confusing conceptual-objective I have encountered so, far. Although, after completing this very challenging conceptual objective I have now a much better understanding of the concept. The class room discussions and problems helped to figure out some of these characteristics of luminosity, size, and temperature of stars. But the biggest learning vital point that came from this objective was being able to imply the things we learned from class into this blog post and to fully understand the objective. The lectured-tutorials on this objective were the biggest learning point on this objective and the article was able for me to get a full understanding of this kind of complicated objective.


Jacob Ybarra


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