ASTR HW 3
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University of Colorado, Boulder *
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1200
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Astronomy
Date
Jan 9, 2024
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docx
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Uploaded by EarlValor12767
ASTR 1200-001 Homework Set 3 (20 Points)
Assigned on Thursday September 9, 2021
Due Thursday September 16, 2021, at 2:20pm
Show your work! Write full sentences explaining each step of your solution.
Use the methods covered during class.
Question 1 – Angles II (10 Points):
If you were on the surface of the moon, how big would the Earth appear to
be on the sky? (estimate the angular size of the Earth viewed from the
moon)
Would it appear bigger or smaller than the Sun?
Diameter of the Earth = 12,700 km
Distance from the Earth to the Moon: 380,000 km
The angular size is 1.91°
The Earth would appear larger than the sun from the surface of the
moon
First I used the arctan formula of arctan(h/D) and plugged in the units and
had arctan(12700/380000) which equaled 1.91° for the diameter. Now to tell
what would appear bigger from the moon, I decided to use the arctan for-
mula again with the diameter of the sun and the distance from the moon to
sun to find the answer. So I put in arctan(1392700/150000000) and that
equaled .53°, so the angular size of the earth from the surface of the moon
would be bigger thus causing it to appear bigger from the moon.
Question 2 – Planets II (10 Points):
What is your age in Martian years? Martian year = 687 Earth days Earth
year= 365.25 Earth days
10.11 years old
First I found the ratio of Martian years and Earth years by dividing 365.25 by
687 and I got .532. Once I had that I multiplied that by my age, which is 19,
and got 10.11.
Extra Credit – Solar System (5 Points):
Which celestial object in the solar system would choose to visit and why?
What technical challenges would you have to deal with if you planned to sur-
vive the trip?
I would go to Mars so I could see the Olympus Mons and get to the top of it
and be on the highest mountain in the solar system, just as long as it won’t
erupt while I’m up there. I think some of the biggest technical challenges
would be handling the surface radiation of Mars and the low air pressure.
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