The Figure Below Shows Three Spiral Galaxies

Q1: How can the velocity dispersion and radius

Q2: Which astronomer discovered dark matter in spiral

Q4: What does the M-sigma relation demonstrate about

Q5: Because of an obscuring atmosphere,an observer in

Q6: An astronomer discovers a knot of emission

Q7: In the early 20th century,some astronomers incorrectly

Q8: Why is rapid variability (over the course

Q9: Name three aspects of elliptical galaxies that

Q10: Two elliptical galaxies have identical radii and

Q11: Which astronomer definitively established the existence of