An Astronomer Wants to Observe a Cloud of Dust in a Relatively

question 3

Multiple Choice

An astronomer wants to observe a cloud of dust in a relatively close part of the Galaxy. Unfortunately, this dust cloud is not located in the direction of a crowded region of stars. What instrument would be the most help in finding this cloud.

• A) a visible-light telescope (like the Keck) with a camera or CCD detector
• B) an x-ray telescope in orbit around the Earth
• C) a giant vat of cleaning fluid deep in a mine-shaft
• D) a sensitive infra-red telescope in orbit around the Earth
• E) a spectroscope that can search for the line radiation from highly ionized atoms