Gentle Gravitational Tidal Forces Appear to Be Necessary to Create

Q46: A key piece of evidence that leads

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

Q52: The identification of "spiral nebulae" as large

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