Podcast
Questions and Answers
What is the primary reason why we do not observe the mass in the outer regions of galaxies in visible light?
What is the primary reason why we do not observe the mass in the outer regions of galaxies in visible light?
- It is obscured by the visible stellar systems.
- It is too far away from the center of the galaxy.
- It is not very luminous. (correct)
- It is not in the plane of our Milky Way.
What would happen to the spiral arms of galaxies if they consisted of the same material?
What would happen to the spiral arms of galaxies if they consisted of the same material?
- They would wind up very tightly. (correct)
- They would disappear over time.
- They would remain straight and unwound.
- They would change into elliptical galaxies.
Why do the orbital periods of stars in galactic disks vary?
Why do the orbital periods of stars in galactic disks vary?
- Because of the age of the stars in the galaxy.
- Because of the density of stars in the galaxy.
- Because of the uniform rotation of the galaxy.
- Because of the differential rotation of the galaxy. (correct)
What is the implication of not observing tightly wound spiral arms in galaxies?
What is the implication of not observing tightly wound spiral arms in galaxies?
What is the name of the scientist who described the orbits of stars in self-gravitating stellar disks?
What is the name of the scientist who described the orbits of stars in self-gravitating stellar disks?
What type of motion do stars in self-gravitating stellar disks exhibit?
What type of motion do stars in self-gravitating stellar disks exhibit?
What is the shape of the distribution of globular clusters in the galaxy according to Shapley's findings?
What is the shape of the distribution of globular clusters in the galaxy according to Shapley's findings?
What was the significance of Shapley's discovery of the globular cluster distribution?
What was the significance of Shapley's discovery of the globular cluster distribution?
What advantage did Shapley have over Kapteyn in determining the distribution of globular clusters?
What advantage did Shapley have over Kapteyn in determining the distribution of globular clusters?
What did Jan Oort measure to determine the dynamics of the galactic disk near the sun?
What did Jan Oort measure to determine the dynamics of the galactic disk near the sun?
What was the model of the disk of our galaxy near the sun according to Jan Oort's research?
What was the model of the disk of our galaxy near the sun according to Jan Oort's research?
What was the shape of the distribution of bright, giant stars observed by Jan Oort?
What was the shape of the distribution of bright, giant stars observed by Jan Oort?
What is thought to be responsible for the strength and beauty of the spiral in the Whirlpool Galaxy, M51?
What is thought to be responsible for the strength and beauty of the spiral in the Whirlpool Galaxy, M51?
What was the limitation of the computer simulation of the passage of the smaller galaxy past M51?
What was the limitation of the computer simulation of the passage of the smaller galaxy past M51?
What is the purpose of using computer simulations in astronomy?
What is the purpose of using computer simulations in astronomy?
What is the predicted outcome of the passage of the companion galaxy by M51?
What is the predicted outcome of the passage of the companion galaxy by M51?
What is the main difficulty in using General Relativity to calculate the behavior of two very compact massive objects in close proximity?
What is the main difficulty in using General Relativity to calculate the behavior of two very compact massive objects in close proximity?
What is the focus of the discussion of General Relativity in this context?
What is the focus of the discussion of General Relativity in this context?
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