_____ is the change in the apparent relationshipbetween two fixed objects caused by the movementof anobserver.
A. Fusion
B. Parallax
C. Red shift
D. The Doppler effect
B. Parallax
Explanation: Measuring the distance to the stars is a subtle and complex problem. The ancient Greeks already knew in principle how todo it—through the use of parallax: the change in the apparent relationship between two fixed objects caused by the movementof the observer. Parallax depends on the fact thatas the observermoves, objects in the middle distance (suchas a nearby star) seem to move against objectsthat are farther away (such as more remote stars or galaxies).
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