4
QuizMultiple Choice

Star Systems and Galaxies

Question 4 • 2001310 Earth Science Sem 1 - Pearson

The dimmer star in a two-star system passes in front of the brighter star. Which phenomenon does this describe?

Answer
A
nebular cluster
B
globular cluster
C
wobbling binary
D
eclipsing binary

Explanation

When one star passes in front of the other from our point of view, it blocks some of the brighter star’s light. This causes the system’s observed brightness to dim periodically, which is the defining feature of an eclipsing binary. A wobbling binary is identified by motion that makes a star appear to shift back and forth.

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