ENV 305 Online - Week 15 Assignment
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School
Wilmington University *
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Course
ENV-305
Subject
Astronomy
Date
Feb 20, 2024
Type
docx
Pages
2
Uploaded by CoachSummer13763
ENV 305 Online - Week 15 Assignment
Page 714, question 1: Refer to the accompanying spectra, which represent four identical stars in our galaxy. One star is not moving relative to you, another is moving away from you, and two stars are moving toward you. Determine which star is which and explain how
you reached your conclusion.
Star A, so it is moving away from the observer the wavelength increase frequency decrease Star C and D, so they are moving toward the observer the wavelength decrease frequency
increase
Star B is not moving relative to the observer everything stays the same Page 714, question 5 a-c: Refer to Figure 23.20 to answer the following questions: a. Is the atmosphere mostly transparent or mostly opaque to visible light? b. Is the atmosphere mostly transparent or mostly opaque to radio waves with a wavelength of 1 meter (3 feet)?
c. Is the atmosphere mostly transparent or mostly opaque to gamma rays? a.
Visible light – Other factors too are there which determine penetration of light in earth's atmosphere. Like - composition of atmosphere, atmospheric temperature and penetration.
b.
Radio waves – a range of wavelengths where earth is relatively transparent to radio waves
c.
Gamma rays – Ionization of atoms and molecules in the atmosphere leads to formation of electron - positron pairs in the influence of gamma rays.
Page 738-739, question 1 a-f: Assume that NASA is sending space probes to each of the locations listed below. Arrange the order in which each probe will encounter its destination, from nearest Earth to farthest
.
a.
Polaris b.
The sun
c.
Juputer
d.
A comet near the outer edge of our solar system
e.
The far edge of thed milky way galaxy
f.
The andromeda galaxy
Page 738-739, question 2: How a star evolves is closely related to its mass as a main-
sequence star. Complete the accompanying diagram by labeling the evolutionary stages for
the three groups of main-sequence stars shown.
a.
Low Mass Star → red gaint b.
Intermediate Mass Star → red giant, planetary nebula, white dwarf
c.
High Mass Star → red super giant, supernova, neutron star or blackhole
Page 738-739, question 5 a-c: Refer to the accompanying photos of an elliptical galaxy and a spiral galaxy to answer the following: a. Which image (A or B) is an elliptical galaxy? b. Which of these galaxies appears to contain more young, hot, massive stars? How did you determine your answer? c. When stars are born from a cloud of dust and gases, high-and low-mass stars from at about the same time. Which group of stars, high-mass or low-mass, will die out first? Over time, how will this affect the color of the light we observe coming from this group of stars?
Studying the distribution and types of stars within the galaxy, as well as its morphology, can provide clues to its age. Irregular or spiral galaxies with ongoing star formation might be younger compared to elliptical galaxies with mostly older stars. An elliptical galaxy is a type of galaxy characterized by its smooth and nearly featureless appearance. It typically lacks the distinct spiral arms seen in spiral galaxies. Elliptical galaxies
are often older and composed mostly of older stars, with relatively little ongoing star formation. They come in various sizes and can range from nearly spherical to highly elongated shapes.
High-mass stars typically have shorter lifespans and will exhaust their nuclear fuel faster, leading them to die out first. As they go through intense supernova explosions, they can enrich the surrounding environment with heavier elements. This can affect the color of the light we observe from the group of stars, making it appear more enriched with colors beyond the visible spectrum due to increased metallicity.
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