I recently read in article called, “Earth’s Sun: Facts about the Sun Age, Size and History” by, Charles Q. Choi. This article relates to the 7th conceptual objective, “I can explain how astronomers use light to determine the chemical consumption, the speed and the direction of an astronomical object’s motion.” Charles Choi explains how the Sun lies at the heart of the solar system, where it is by far the largest object. It holds 99.8 percent of the solar systems mass and is roughly 109 times the diameter of the Earth. The visible part of the sun is about 10,000 degrees Fahrenheit, while temperatures in the core reach more the 27 million degrees Fahrenheit. In order to match the the energy produced by the Sun, they would need to explode 100 billion tons of dynamite every second, according to NASA. The Sun is one of more than a billion other stars in the Milky Way. Many astronomers think the sun and the rest of the solar system formed from a giant, rotating cloud of gas and dust known as the solar nebula. The sun has enough nuclear fuel to stay much as it is now for another five billion years. The sun along with its atmosphere is divided into several zones and layers. The solar interior, from the inside out is made up of the core, radioactive zone, and the convective zone. Just like most other stars, the sun is made up mostly of hydrogen, followed by helium Nearly all the reaming matter consist of seven other elements( Oxygen, Carbon, Neon, Nitrogen, Magnesium, Iron, and Silicon). For every one billion atoms of hydrogen the sun, there are 98,000 of helium, 850 of oxygen, 360 carbon, of neon, 110 of nitrogen, 40 of magnesium, 35 of iron, and 35 of silicon. Still, hydrogen is lightest of all elements, so it is roughly 72% of the sun’s mass, while helium males up about 26%.
The way we measure light is by a spectra. A spectra is when you take light and spread it put in a wave length. This colors are divided into the primary colors. Which are magenta, yellow, cyan, red , yellow , and blue. We did an experiment in class where we looked at three different spectrum’s and we were able to see which colors they would show. Here are two pictures from two of the lights we looked at through a spectrum during class.
This devise showed us the spectra, in the detraction ratios, which shows the wavelength in nano-meters. We also did active in are lecture tutorial book. Which explain the types of spectra’s. Which are continuous, defective, and absorption. Which lead use into the Doppler effect, which is an emission of light wave and rotation spectrum. Where we did an active in are tutorials which exposed use to absorption lines. And we learned how to read and how they can tell us which is a short blue wavelength or a red long wave length.
From reading the article to the experiments during class I was able to understand the 7th conceptual objective pretty clearly. It was also interesting learning about the Sun and how the article showed the size compared to the Earth. Also the chemical composition which we learned in class as well. The article also talked about the three basic elements in space and they are, Helium, hydrogen, and metals.