Astronomy Exam 2 Part 3

Reviewed by Editorial Team
The ProProfs editorial team is comprised of experienced subject matter experts. They've collectively created over 10,000 quizzes and lessons, serving over 100 million users. Our team includes in-house content moderators and subject matter experts, as well as a global network of rigorously trained contributors. All adhere to our comprehensive editorial guidelines, ensuring the delivery of high-quality content.
Learn about Our Editorial Process
| By Mllanos87
M
Mllanos87
Community Contributor
Quizzes Created: 3 | Total Attempts: 444
| Attempts: 149
Quiz Flashcard
SettingsSettings
Please wait...
  • 1/10 Questions

    Where is the center of the universe

    • A. There is no center.
    • B. the Earth
    • C. the Sun
    • D. the Milky Way
    • E. the Big Bang
Please wait...
About This Quiz

Astronomy Exam 2 part 3 explores key concepts in stellar evolution, galaxy structure, and cosmology. It assesses understanding of star classifications, life cycles, and the broader universe, targeting advanced knowledge in astronomy.

Astronomy Exam 2 Part 3 - Quiz

Quiz Preview

  • 2. 

    Which spectral class star on the main sequence has the largest mass?

    • M star

    • O star

    • A star

    • G star

    • F star

    Correct Answer
    A. O star
    Explanation
    O stars are the hottest and most massive stars on the main sequence. They have temperatures above 30,000 Kelvin and can have masses more than 20 times that of the Sun. This makes them much larger and more massive than M, A, G, and F stars.

    Rate this question:

  • 3. 

    21. Compared to a cool red main sequence star, a hot blue main sequence star has  

    • A. more fuel and a longer life.

    • B. more fuel and a shorter life.

    • C. less fuel and a shorter life.

    • D. less fuel and a longer life.

    • E. You can’t say from the given information.

    Correct Answer
    A. B. more fuel and a shorter life.
    Explanation
    A hot blue main sequence star has a higher surface temperature than a cool red main sequence star. This higher temperature causes the hot blue star to burn through its fuel at a faster rate, resulting in a shorter lifespan compared to the cool red star. Therefore, option B is the correct answer as it states that the hot blue star has more fuel but a shorter life.

    Rate this question:

  • 4. 

    For a star with the sun’s mass, we expect that after all the hydrogen in the core is fused, the star will next become

    • a nova

    • A white dwarf

    • A red giant

    • A supergiant

    • A supernova

    Correct Answer
    A. A red giant
    Explanation
    When a star with the sun's mass exhausts all the hydrogen in its core, it will enter the next stage of its evolution, which is becoming a red giant. During this phase, the star's core contracts while the outer layers expand, causing the star to increase in size and become much brighter. Eventually, the red giant will shed its outer layers and form a white dwarf, which is a dense, hot remnant of the star's core.

    Rate this question:

  • 5. 

    . The Universe is said to be closed if

    • A. the density of the Universe is less than the critical density.

    • B. the Universe has a center and an edge.

    • C. gravity is strong enough to stop the expansion in a finite time.

    • D. the Hubble Constant is less than 50 km/s/Mpc.

    • E. holiday shopping hours are restricted.

    Correct Answer
    A. C. gravity is strong enough to stop the expansion in a finite time.
    Explanation
    The correct answer is C because in a closed universe, gravity is strong enough to eventually stop the expansion of the universe. This means that the expansion will eventually slow down and reverse, causing the universe to collapse in on itself. In contrast, an open universe would continue expanding forever, and a flat universe would expand at a constant rate. The density of the universe (option A), the existence of a center and edge (option B), and the value of the Hubble Constant (option D) are not indicative of whether the universe is closed or not. Option E is unrelated to the concept of a closed universe.

    Rate this question:

  • 6. 

    An observer far outside our galaxy would best describe our galaxy and the Sun’s position in it as a

    • A. disk of stars with our Solar System near the edge.

    • B. disk of stars centered on our Solar System.

    • C. disk of stars with a bulge containing our Solar System.

    • D. sphere of stars centered on our Solar System.

    • E. sphere of stars with our Solar System near the edge.

    Correct Answer
    A. A. disk of stars with our Solar System near the edge.
    Explanation
    An observer far outside our galaxy would see our galaxy as a disk of stars because most galaxies are disk-shaped. The observer would also see our Solar System near the edge of this disk because our Sun is located in one of the spiral arms of the galaxy, rather than in the center. Therefore, the correct answer is A. disk of stars with our Solar System near the edge.

    Rate this question:

  • 7. 

    Most of the mass of a galaxy is

    • A. contained in the massive O and B stars in the galaxy.

    • B. contained in the H I regions of the galaxy.

    • C. contained in the H II regions of the galaxy.

    • D. contained in the dark matter of the galaxy.

    • E. contained in the disk of the galaxy

    Correct Answer
    A. D. contained in the dark matter of the galaxy.
    Explanation
    The correct answer is D because dark matter is a type of matter that does not emit, absorb, or reflect light, making it invisible to direct observation. It is believed to make up the majority of the mass in a galaxy based on its gravitational effects on visible matter. Therefore, most of the mass of a galaxy is contained in the dark matter.

    Rate this question:

  • 8. 

    Younger stars have more heavy elements because

    • A. old stars destroy heavy elements as they age.

    • B. the heavy elements were made in previous generations of stars.

    • C. young stars burn their nuclear fuels faster.

    • D. heavy elements haven’t had time to settle to the core of these younger stars.

    • E. all of the above.

    Correct Answer
    A. B. the heavy elements were made in previous generations of stars.
    Explanation
    Younger stars have more heavy elements because these heavy elements were made in previous generations of stars. As stars age and go through their life cycles, they undergo nuclear fusion reactions that create heavier elements. These heavier elements are then released into space when the stars explode as supernovae. The debris from these explosions can then become the building blocks for new stars, resulting in younger stars having a higher abundance of heavy elements.

    Rate this question:

  • 9. 

     For which of the following objects does Hubble’s Law work?

    • A. Clouds in the Milky Way

    • B. Distant galaxies

    • C. Local group galaxies

    • D. Nearby stars

    • E. All of the above

    Correct Answer
    A. B. Distant galaxies
    Explanation
    Hubble's Law states that the recessional velocity of a galaxy is directly proportional to its distance from us. This means that the farther a galaxy is from us, the faster it is moving away from us. Therefore, Hubble's Law only applies to distant galaxies, as they are the ones that are moving away from us at high velocities. Local objects such as clouds in the Milky Way, local group galaxies, and nearby stars are not moving away from us at such high velocities, so Hubble's Law does not apply to them.

    Rate this question:

  • 10. 

    Which of the following is a characteristic of the halo component of the Milky Way?

    • A. circular stellar orbits

    • B. high metal abundance

    • C. young stars

    • D. randomly inclined stellar orbits

    • E. active star formation regions

    Correct Answer
    A. D. randomly inclined stellar orbits
    Explanation
    The halo component of the Milky Way is characterized by randomly inclined stellar orbits. This means that the stars in the halo do not all orbit in a single plane, but instead have orbits that are randomly oriented. This is in contrast to the disk component of the Milky Way, where the stars have more circular orbits that lie in a relatively flat plane. The randomly inclined stellar orbits in the halo are thought to be a result of the formation and accretion of smaller satellite galaxies over time.

    Rate this question:

Quiz Review Timeline (Updated): Aug 19, 2024 +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Aug 19, 2024
    Quiz Edited by
    ProProfs Editorial Team
  • Apr 29, 2010
    Quiz Created by
    Mllanos87

Popular Topics

Back to Top Back to top
Advertisement
×

Wait!
Here's an interesting quiz for you.

We have other quizzes matching your interest.