ASTRO 7N - UNIT 4 PART 1 (quiz)
UPDATED ACTUAL Exam Questions and
CORRECT Answers
What are the differences between open star clusters and globular star clusters? - CORRECT
ANSWER - open clusters are less concentrated, younger, and have fewer stars
Which of the following is FALSE? - CORRECT ANSWER - A nova is more luminous
than a supernova
What kind of a gas cloud can collapse and form stars? - CORRECT 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? - CORRECT
ANSWER - 4 million solar masses
How do you measure the mass of the supermassive black hole at the center of the Milky Way? -
CORRECT ANSWER - Look at the orbits of nearby stars and apply Kepler's third law
About how long does light take to cross the Milky Way Galaxy? - CORRECT ANSWER -
About 100,000 years
What does our Galaxy look like? - CORRECT ANSWER - A. It has a large disk with
spiral arms, and is relatively flat and thin
B. It has clouds of gas and dust in the spiral arms
C. Older yellow stars are found mostly in the center bulge
D. Old stars and globular clusters are located in a spherical halo above and below the disk.
E. All of the above
UPDATED ACTUAL Exam Questions and
CORRECT Answers
What are the differences between open star clusters and globular star clusters? - CORRECT
ANSWER - open clusters are less concentrated, younger, and have fewer stars
Which of the following is FALSE? - CORRECT ANSWER - A nova is more luminous
than a supernova
What kind of a gas cloud can collapse and form stars? - CORRECT 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? - CORRECT
ANSWER - 4 million solar masses
How do you measure the mass of the supermassive black hole at the center of the Milky Way? -
CORRECT ANSWER - Look at the orbits of nearby stars and apply Kepler's third law
About how long does light take to cross the Milky Way Galaxy? - CORRECT ANSWER -
About 100,000 years
What does our Galaxy look like? - CORRECT ANSWER - A. It has a large disk with
spiral arms, and is relatively flat and thin
B. It has clouds of gas and dust in the spiral arms
C. Older yellow stars are found mostly in the center bulge
D. Old stars and globular clusters are located in a spherical halo above and below the disk.
E. All of the above
