Multiple Choice
The figure below shows how the space density of a particular astronomical object depends on cosmic time.What kind of object does it show? 
A) spiral galaxies
B) heavy elements
C) quasars
D) stars
Correct Answer:
Verified
Correct Answer:
Verified
Related Questions
Q1: How do astronomers know that dark matter
Q2: Which of the following describes a void?<br>A)
Q3: Which of the following would increase the
Q5: Suppose Hubble's constant was equal to 300
Q6: Which of the following discoveries disproved Aristotle's
Q7: How has the rate at which galaxies
Q8: Which of the following statements is typically
Q9: Collisions are important in forming:<br>A) elliptical galaxies.<br>B)
Q10: Which physical law allows astronomers to probe
Q11: A region 1 Mpc across contains a