Galactic Dynamics MCQs with Answers

What is the name of the process by which galaxies lose gas and dust due to interactions with other galaxies or environmental effects?

Which of the following is a proposed mechanism for the formation of spiral arms in galaxies?

What is the name of the distribution of stars and interstellar matter that extends beyond the visible edge of a galaxy?

Which of the following is a technique used to measure the mass of a galaxy by observing the rotation curves of stars or gas?

What is the term for the distance from the center of a galaxy at which the rotation curve begins to flatten out?

Which of the following is a type of galaxy that exhibits a mixture of features from both elliptical and spiral galaxies?

What is the term for the spherical distribution of stars and dark matter that surrounds the central regions of a galaxy?

Which of the following is a proposed mechanism for the formation of galaxy clusters?

What is the term for the rate at which a galaxy's rotation curve declines with increasing distance from the center?

What is the term for the phenomenon where galaxies are moving away from each other due to the expansion of the universe?

What is the term for the apparent bending of light rays from distant objects due to the gravitational field of a galaxy?

What is the term for the process by which galaxies exchange material through gravitational interactions?

What is the primary source of the gravitational potential that governs the motion of stars within a galaxy?

Which type of galaxy is characterized by a spheroidal shape and lacks distinct spiral arms or a disk component?

What is the term for the group of stars that orbit a galaxy's center at roughly the same distance and in the same direction?

Which of the following is a proposed explanation for the discrepancy between observed galactic rotation curves and those predicted by Newtonian dynamics?

What is the term for the region in the center of a galaxy where stars are densely packed and often contains a supermassive black hole?

Which of the following is a measure of the degree of randomness in the orbits of stars within a galaxy?

What is the name of the phenomenon where galaxies are bound together by their mutual gravitational attraction?

Which of the following components of a galaxy is thought to dominate the gravitational potential in its outer regions?

What is the term for the process by which galaxies collide and merge, leading to the formation of larger galaxies?

What is the name of the process by which galaxies interact and merge with each other, leading to the formation of larger galaxies?

Which of the following is a method used to measure the mass of a galaxy by observing the velocities of its globular clusters?

Which of the following is a proposed explanation for the observed alignment of satellite galaxies around more massive galaxies?

Which of the following is a key assumption of the virial theorem in the context of galactic dynamics?

What is the name of the spherical distribution of stars and dark matter that surrounds the central regions of a galaxy and is typically more massive than the visible components?

Which of the following is a method used to estimate the mass of a galaxy by measuring the velocities of its satellite galaxies?

What is the name of the process by which galaxies are distributed throughout the universe in a filamentary or web-like structure?

What is the term for the process by which galaxies lose their gas and dust due to gravitational interactions with neighboring galaxies?

Which of the following is a proposed explanation for the formation of the Milky Way's spiral arms?

Which of the following is a measure of the total luminosity emitted by a galaxy in all wavelengths of light?

What is the name of the spherical distribution of stars and dark matter that surrounds the central regions of a galaxy and extends far beyond its visible edge?

What is the term for the total mass contained within a specific radius in a galaxy, typically measured in solar masses?

Which of the following is a method used to estimate the mass of a galaxy cluster based on the motion of its member galaxies?

Which of the following is a measure of the spread of velocities among stars within a galaxy?

What is the name of the relationship between the luminosity and rotation velocity of spiral galaxies, used to estimate their distances?

What is the name of the theoretical model used to describe the distribution of mass in galaxies?

Which of the following is a method used to estimate the mass of a galaxy cluster based on the X-ray emission from its hot gas?

Which of the following is a method used to estimate the mass of a galaxy by analyzing the gravitational lensing effects on background objects?

Which type of galaxy is characterized by a flat, rotating disk of stars, gas, and dust, along with distinct spiral arms?