nats1740m-UCA6-instructions (1)
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York University *
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Course
1740
Subject
Astronomy
Date
Jan 9, 2024
Type
Pages
2
Uploaded by PresidentGrousePerson764
UCA6
Due: April 6, 2023
Instructions: Homework Assignment #6
NATS 1740M - Astronomy
Due: Thursday April 6, 2023 by 11:59pm
Open an empty document in any word-processing software (Word, Pages, Google Docs, etc.),
and write your name, student number, and ‘Unit Completion Assignment #6’ at the very top.
Using what you know from lectures, readings, and the AAS WorldWide Telescope (WWT;
https://worldwidetelescope.org/webclient/), put your answers to the questions below in that
document. Submit your assignment to the UCA6 submission link provided.
—
Question 1
Choose the constellation from the list below that is numbered with the last number in your
student number. (
eg, if your student number is 200294014, then you would choose Ursa Major,
as it is number ‘4’ in the list, and that is the last number in your student number
).
Locate your constellation on the sky. Right click on the viewing screen to enable the finder
scope. Move the viewing screen around such that objects within the boarders of your
constellation land within the cross hairs of the finder scope.
A)
[6 marks] Create a table in your word document/google doc that resembles the one below.
Search within the boarders of your assigned constellation for an
example of each of the galaxy types in the table above. See below
for instructions on how to find the information to fill in this table.
Figure 1
. To determine what type of galaxy you have found, place
the galaxy within the finder scope field of view, click on Research ->
Information -> Look up on SIMBAD. See image to the left.
0. Virgo
1. Andromeda
2. Pegasus
3. Hercules
4. Ursa Major
5. Camelopardalis
6. Bootes
7. Ursa Minor
8. Pisces
9. Draco
My student number:
My constellation:
Galaxy Type
Name of Galaxy
Screen shot of Finder Scope
Galaxy Data from SIMBAD
Spiral (S)
Elliptical (E)
Irregular (Irr)
NATS1740M Astronomy
© Jesse Rogerson
York University
UCA6
Due: April 6, 2023
Figure 2
. Find the ‘morphological type’ from the list of data
(highlighted in the image on the left). In this example, the
morphological type is ’S/Irr,’ which means it is somewhere
between a spiral and Irregular galaxy. It could be used for
either entry on the table.
To see an example of what the above table would look like when you are complete, check out
the ‘UCA-6 - Sample Table’ in the Unit Completion assignment section of the course’s eClass
site.
In your table, provide the name of the galaxy, a screen shot of the galaxy within the finder
scope (similar to Fig. 1), and a screen shot of the morphological type from SIMBAD (similar to
Fig. 2).
B) [1 marks] As you were searching for your three galaxies, which type of galaxy did you most
often find?
Question 2 [5 marks]
Compare the three types of galaxies you found above: spirals, ellipticals, and irregulars.
Important things you should consider are: the size of the galaxies, their mass, their stellar
populations, their colours, their shape, and any other comparisons you want to make. You may
want to rely on your lecture materials and readings for this answer.
Question 3 [4 marks]
On WWT, in the bottom left of the screen, ensure the “Imagery” is set to “
Planck CMB
” in the
bottom left of the screen. This is an all-sky microwave image, which was pieced together by
taking thousands of images using the Planck Telescope. The image shows that, no matter what
direction you look, there is microwave light coming from that direction. Why is this such an
important result, and how did it confirm the Big Bang Theory?
BONUS [1 mark]
: Notice that the Cosmic Microwave Background is not exactly the same in all
directions. What is the di
ff
erence in temperature from the ‘hottest’ parts to the ‘coldest’ parts?
NATS1740M Astronomy
© Jesse Rogerson
York University
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