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Astro 001 Exam 4 Questions and Answers 100%
Pass
What are the differences between open star clusters and globular star clusters? - ANSWER ✔✔-Open
clusters are less concentrated, younger, and have fewer stars
Which of the following is false? - ANSWER ✔✔-A nova is more luminous than a supernova
What kind of gas cloud can collapse & form stars? - ANSWER ✔✔-The gas cloud must have a mass that
exceeds the Jeans mass so that gravity overcomes the internal pressure in the cloud
What is the mass of the black hole at the center of the Milky Way? - ANSWER ✔✔-4 million solar masses
How do you measure the mass of the super massive black hole at the center of the Milky Way? -
ANSWER ✔✔-Look at the orbits of nearby stars & apply Kepler's 3rd law
About how long does it take light to cross the Milky Way galaxy? - ANSWER ✔✔-About 100,000 years
What does our galaxy look like? - ANSWER ✔✔-All the above; large disk with spiral arms & relatively
flat & thin, clouds of dust & gas in spiral arms, old yellow stars found at center bulge, old stars &
globular clusters located in spherical halo
Why do stars in the halo have almost no heavy elements i.e. C, N, O? - ANSWER ✔✔-Halo stars formed
before these elements were made
Where do stars form in the galaxy today? - ANSWER ✔✔-In the disk
Where are open clusters found? - ANSWER ✔✔-In the disk
In the symbol for Hubble type galaxy, SBc, the "B" denotes.... - ANSWER ✔✔-The presence of a bar
Created by Grace Amelia © 2025, All Rights Reserved.
Astro 001 Exam 4 Questions and Answers 100%
Pass
What are the differences between open star clusters and globular star clusters? - ANSWER ✔✔-Open
clusters are less concentrated, younger, and have fewer stars
Which of the following is false? - ANSWER ✔✔-A nova is more luminous than a supernova
What kind of gas cloud can collapse & form stars? - ANSWER ✔✔-The gas cloud must have a mass that
exceeds the Jeans mass so that gravity overcomes the internal pressure in the cloud
What is the mass of the black hole at the center of the Milky Way? - ANSWER ✔✔-4 million solar masses
How do you measure the mass of the super massive black hole at the center of the Milky Way? -
ANSWER ✔✔-Look at the orbits of nearby stars & apply Kepler's 3rd law
About how long does it take light to cross the Milky Way galaxy? - ANSWER ✔✔-About 100,000 years
What does our galaxy look like? - ANSWER ✔✔-All the above; large disk with spiral arms & relatively
flat & thin, clouds of dust & gas in spiral arms, old yellow stars found at center bulge, old stars &
globular clusters located in spherical halo
Why do stars in the halo have almost no heavy elements i.e. C, N, O? - ANSWER ✔✔-Halo stars formed
before these elements were made
Where do stars form in the galaxy today? - ANSWER ✔✔-In the disk
Where are open clusters found? - ANSWER ✔✔-In the disk
In the symbol for Hubble type galaxy, SBc, the "B" denotes.... - ANSWER ✔✔-The presence of a bar
Created by Grace Amelia © 2025, All Rights Reserved.
