Brianna Nelson Inforative speech
docx
keyboard_arrow_up
School
Northern Virginia Community College *
*We aren’t endorsed by this school
Course
131
Subject
Communications
Date
Feb 20, 2024
Type
docx
Pages
4
Uploaded by DukeSteel13265
Name. Brianna Nelson
Assignment. Informative speech
Class number and section. CST 110 022N
Date 4/20/2023
The Final Frontier
Specific purpose
: to educate the communication class on space telescopes and JWST.
Central Idea
: How cool space is and how beautiful the images JWST can make and how amazing a feat it is.
Introduction
I.
Attention Getter: Space, the final frontier, you have heard these words before but today they ring even truer. With all the land on earth having been mapped and scientific discovery’s becoming ever more esoteric humans have once again turned their eyes to the stars to continue their ceaseless quest for knowledge. However, as it always is with humans our humble bodies are incapable of seeing what needs to be seen, so we turn to technology, we turn to the James Webb Space Telescope.
II.
My name is Brianna Nelson and today you will be learning the ins and out of the most powerful space telescope ever created, and you will see with your own eyes the depths of the cosmos.
III.
Establish your credibility I have taken multiple astronomy classes, watched many documentaries, and spent hours researching space in my free time.
IV.
Preview your main points: I will explain why need a space telescope to view the best stuff and why we needed to replace Hubble, I will explain how JWST works, and I will show you how amazing the images from it look and what’s in them.
Connective: Lets go to my first point, why we need a space telescope and why we needed to replace Hubble
Body
Main point 1: Why we need a space telescope and why we needed to replace Hubble
a.
A telescope in space is better than one on earth because we don’t have to worry about atmospheric interference, Elaborate on issues with land telescopes and boons with space ones.
b.
With the right orbital positioning we don’t need to worry about other celestial bodies blocking the view and space is a natural cooler for parts that may overheat.
So NASA positioned it in a good place “
The James Webb Space Telescope is not in orbit around the Earth, like the Hubble Space Telescope is - it actually orbits the Sun, 1.5 million kilometers (1 million miles) away from the Earth”
c.
Hubble uses visible light spectrum while JWST uses Infrared spectrum, meaning that JWST and view longer energy wavelengths so it can see further into space, Also due to the size difference in the mirrors, with Hubble’s mirror being 7.9 feet wide and JWST’s being 21.7 feet wide, and other improvements JWST is 100 X more powerful than Hubble. Hubble was also having repair issues and its obits close to earth so more interference.
Connective:
Complicated feats of engineering can be difficult to understand so now I will try and explain how the James Webb Space Telescope works.
II.
Main point 2: Engineering quality’s
a.
As mentioned Before unlike previous space telescopes JWST works with the infrared spectrum of light. Infrared light is a better medium to view celestial bodies through as it can pass through dust, which is one of the largest obstacles to space telescopes. Show on aid how infrared light is collected for viewing
b.
JWST during the design phase faced a few issues, one of the main ones being that
in order to detect very faint infrared energy the craft needs to be kept extremely cold, About -370 farenheight. So they designed one of the most advanced heat shields ever and in order to do that they needed a special material, According to NASA “
The sunshield is made of a lightweight material with special thermal properties, called Kapton” This shows another advantage to the position of orbit far from earth, the location that they chose allows for the heat shield to be positioned towards the sun for it’s entire orbit without having to be moved
Connective: But the beauty of James Webb is not just in the technical but in the photographic
III.
Main point 3: Amazing images a.
The images that can be produced from JSWT are just absolutely incredible we can
see nebulas and galaxy’s like we have never seen before, Dr John Mather senior project scientist for JWST says it will be able “
to see a period of the universe's history
that we have not seen yet before
. Specifically we want to see the first objects that formed as the universe cooled down after the Big Bang” b.
What is depicted here is the Carina Nebula, it is one of the largest and brightest nebulas in our galaxy, it is home to the brightest star in the milky way WR 25 in the Trumpler 16 star cluster, But most importantly it is a stellar nursery. Stellar nursery are molecular could regions dense in hydrogen that over time will coalesce into stars, in this images you can see stars forming, Point out tiny purplish blue dots in cloud. Explain why stellar nebulas are important to the universe.
Connective: But now it is time to wrap up our journey through the cosmos.
Conclusion
(about half as long as the introduction)
I.
Review the topic: Today we discussed the James Webb Space telescope and its ins and outs.
II.
Review of 3 main points: the benefits of space telescope have over land telescopes and why we needed to replace Hubble, How James Webb Space Telescope works, and viewed and discussed an amazing image from it.
III.
Wow ending. Space is one of the great unexplored vastness’s of the universe that still puzzles and amazes humans to this day, there is so much that we haven’t seen and so mystery’s to solve, But don’t even get me started on the ocean now there’s where the real aliens live.
Your preview ends here
Eager to read complete document? Join bartleby learn and gain access to the full version
- Access to all documents
- Unlimited textbook solutions
- 24/7 expert homework help
References
Comparison Of Imaging From The Ground And Space
. (2004). HUBBLESITE. Retrieved April 20, 2023, from https://hubblesite.org/contents/media/images/2004/07/1461-Image.html?
news=true. Cosmic Cliffs in the Carina Nebula
. (2022). WEBB space telescope. Retrieved April 20, 2023, from https://webbtelescope.org/contents/media/images/2022/031/01G77PKB8NKR7S8Z6HBX
MYATGJ?keyword=cliff. Labeled diagram of James Webb Space Telescope
. (2022). The Space Techie. Retrieved April 20, 2023, from https://www.thespacetechie.com/james-webb-hubble-telescope/. Mather, J. (2022). Webb and the big bang - webb/NASA
. NASA. Retrieved April 20, 2023, from https://webb.nasa.gov/content/features/bigBangQandA.html NASA. (n.d.). Orbit - Webb/NASA
. NASA. Retrieved April 20, 2023, from https://webb.nasa.gov/content/about/orbit.html#:~:text=The%20James%20Webb%20Space
%20Telescope,second%20Lagrange%20point%20or%20L2. NASA. (n.d.). The Sunshield Webb/NASA
. NASA. Retrieved April 20, 2023, from https://webb.nasa.gov/content/observatory/sunshield.html