Which of the following could not be measured by an observation that uses only imaging?
A)the rate at which a variable star brightens and dims
B)the general shape of an interstellar cloud of gas
C)the color of a planet
D)the brightness of a star in our sky
E)the number of bright stars in a nearby star cluster

Question

Quizplus · Accepted Answer

The rate at which a variable star brightens and dims requires multiple observations over time, not just imaging.

Which of the Following Could Not Be Measured by an Observation