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First Years: Lesson Four; *Archived* Ravenclaw and Slytherin
Topic Started: Jan 20 2018, 04:50 PM (135 Views)
Professor Sarah Harrington
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Mother of Two Girls | Astronomy Professor | HS Graduate Ravenclaw

[justify]Professor Harrington had been having a lovely day. She was excited to see her first year students again. She heard them outside the door and let them in greeting all of them. "Good Evening! I hope you all are doing well! Today we are going to be discussing the Sun, funnily enough it has a long set past the horizon so we'll just have to use a diagram in viewing the Sun tonight, which will be much better for our eyes anyways," she said setting up a diagram of the Sun in the front of the classroom.

"For millions of years, the Sun has been worshiped as a god, the giver of life and light. Without it we wouldn't be here to talk about it! It allows plants to grow and along with some other basic elements keeps our planet on track." Sarah said as the students began to take notes already."Now, I am going to give you some basic information about the many layers of our sun, so keep some notes, and don't fall asleep." She smiled and then picked up a piece of chalk and began to write on the chalkboard.


ABOUT THE SUN
 
The Core: It is incredibly dense, most would think because of its density it would be a solid however it is so hot, 15 million Kelvin's (27 million degrees Fahrenheit) to be exact, the core is in a gaseous state. The core is the 'heart' of our sun. Here fusion reactions produce energy called gamma rays and neutrinos. Gamma rays are photons with a very high energy and frequency. The rays are absorbed and then re-emitted by atoms on their way out of the sun. The core contains 40% of the suns mass in 10% of its volume.

Solar Envelope: It is broken into two areas, the radioactive envelope, and the convective envelope. This layer is not as dense as the core and its temperature is around 4 million Kelvin's or 7 million degrees Fahrenheit. The Envelop puts pressure on the core and maintains the temperature for fusion to take place. The hotter the gas is the more transparent it is, so this area of the sun is more opaque than the core. This causes it to be less efficient for energy to move by radiation and heat builds up in the radioactive area, this is how the convection zone is created. It is huge cells of moving gas several hundred kilometers in diameter.

Photosphere: This is where our sun light is emitted. This area is a layer of low-pressure gasses just outside the envelope. It is only a few hundred kilometers thick and about 6000 degrees Kelvin. You can find out the composition, temperature, and pressure by analyzing the color spectrum of sunlight. A little side fact, helium was discovered by Mr. William Ramsey. He was analyzing the spectrum of sunlight when he found features that were not present in anything on earth. He named it helium after the Greek God of the Sun Helios.

Chromosphere: After the photo sphere the layers of the sun gradually become hotter again. In an eclipse, you can see this layer on occasion as the red circle outside the sun. Its red color is caused by the amount of Hydrogen. The other layers get cooler as they get farther away from the core; however, this layer is 7000k. Temperature increases through the Corona.

Corona: The Corona is the farthest layer of the sun. It is only visible during an eclipse. It is very low density because it is a cloud of plasma with a high transparency, unlike the inner layers. The white Corona is a million times 'less' bright than the inner layers of the sun but many, many times larger. We find this layer to be hotter than the inner layers with a temperature of 1 million degrees Kelvin or 2 million degrees Fahrenheit as an average but some areas can become 3 million degrees, Kelvin.


"Now, the sun has been studied with a great deal by wizard astronomers and a certain witch notably named Elizabeth Willowvale has noticed that solar flares are not what muggles think they are, as they believe they are storms on the sun, and we won't go into that, but the flares are actually magic projecting out from the Sun towards us, towards the Solar System, and if we didn't have these solar flares there would be no magic, it's what is keeping magic running, and the amount of energy that goes into this is phenomenal." Professor Harrington glanced at her clock on her desk and smiled up at the students.

"Sadly, that is all the time we have for today, you may go once you've finished copying down the board." she smiled. "Oh and don't forget the homework while you're at it." she added. Sarah waited for the last student to head out before going out herself and locking up the rooms behind her. She was feeling tired and was ready for a full night's rest.


Homework:
-Roleplay the lesson and take some notes.
-Write a short essay about the Sun with information not provided in class. (Please make sure to have your source listed once again and by this I mean the website you(ooc) are using for your character!)
[/justify]Astronomy,1,4
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Jacob Finley
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ℐℱ ⋆ Introvert ⋆ Chess ⋆ Writing ⋆ HM Reporter ⋆ Ravenclaw Chaser

Jacob liked astronomy and it was one of his favourite subjects at Hogwarts. The stairs before it were horrible, but the class was interesting. The lesson was going to be about the sun and what it was about. Jacob grabbed his stuff and he was ready to write.

The sun was interesting and Jacob was writing furiously on the paper. The five layers were a lot to write and Jacob was glad he wrote a lot. He was sure some of the other kids were experiencing pain in their hands from this lecture. He smiled and wrote about the Corona and Chromosphere of the sun. It was amazing to hear about and Jacob was glad he could keep up.

The last part shocked him and Jacob wondered how it could be that the sun didn't gave everyone magic, but just a select few. He wasn't sure, but he didn't bother to ask. He was glad he got magic, but missed his adoptive parents. When the lesson ended he left and smiled. Next lesson was going to be another one.
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Diana Holland
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Rose's sister | Cynical | Judgemental | Gossip | Nosy

It hadn't taken Diana Holland long to come to the conclusion that Astronomy was the only good subject Hogwarts had to offer. She liked it a lot more than any of her other classes, even though it was in an inconvenient place and at an inconvenient time. She ook her seat in the classroom and looked at Professor Harrington as she got started. Today it seemed like they were learning about the sun, something that didn't interest Diana as much as things that were further away from Earth, but she still took notes on what the professor said and wrote down on the chalkboard. She wrote down about the core and the other different layers, though she had to double check how to spell a few of them by making sure she was writing it the same way the professor had. What she found most strange but also interesting was the talk about solar flares being magic. She wished the professor elaborated on that a little bit more, but she was still pleased with this lesson and the subject. She packed up her things and left the classroom.
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Sam Mackintosh
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Overachiever | Tomboy | Hates stereotypes and cliches | Hogwarts Monthly Intern

[justify]Astronomy was a subject that Sam was beginning to enjoy quite a lot, she loved learning about space, even though unfortunately there wasn't any science involved. Still, she was happy simply by learning about space with no calculations or formulae included. She liked the way Professor Harrington taught because the information always stuck to her brain. Revising the notes she took in class also helped, of course. She settled herself comfortably in her seat, laying out all of her things in front of her on the desk neatly, as when she learned Sam always needed to have everything in order and not messy.

The sun was always so interesting to learn about; Sam herself didn't know much about it and she felt that it was important knowing more about it. While the professor talked, the first year looked at the diagram, nodding along to the woman‘s words. It did make sense. She took notes as they went along, double checking she had as many notes as possible, and that she was writing a lot. Her hand began cramping so she was really happy when the lesson ended, not so much because she was bored but because she wanted to rest her right hand. She yawned but quickly took down the homework and then packed up before thanking the professor for the lesson and heading out.
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Gerry FitzWallace
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Gerry walked slowly up the stairs to astronomy. Last class had been nice, but she was just not in the right mindset for another lecture. Still, she dutifully pulled out her notebook.

The sun was not a part of the solar system that she knew much about because most of her dad's astronomical interest lay in star gazing. To keep herself from daydreaming too deeply, she sketched a cross-section of the sun. It was easier to label all the layers this way. She added a tiny thermometer at each layer. The Corona had several due to its vulnerability. She added little cracks around the 3 million degrees K one. #1 place not to visit.

The bit about Elizabeth Willowvale caught her attention. Before coming to Hogwarts, she had heard more about the moon's connection to witchcraft than the sun. Still, a scientific...magical...scientifically magical explanation of the sun's flares was interesting. She would have to include this bit in her next letter home to her dad. She could hear him setting up a pinhole viewer already.

Lecture over, she scribbled down her homework assignment and left the classroom.
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