Multiple Choice
The identification of "spiral nebulae" as large groupings of stars outside of our own galaxy was proven by ____.
A) photographic plates made by Edwin Hubble showing stars and Cepheid variables
B) the results of the Shapley-Curtis debate
C) Immanual Kant's "island universe" theory
D) William Parsons' observation and description of their spiral structure
E) Harlow Shapley's observations of their radio spectrum
Correct Answer:
Verified
Correct Answer:
Verified
Q47: In general, _.<br>A) spiral galaxies are the
Q48: What direct evidence is there for galactic
Q49: The farthest galaxies that astronomers have seen
Q50: An astronomer would find a type Ia
Q51: Gentle gravitational tidal forces appear to be
Q53: All of the farthest detectable galaxies are
Q54: Hot, low-density gas can be detected in
Q55: In which of the following types of
Q56: Why are methods to determine the distances
Q57: Galactic collisions _.<br>A) are very rare, since