The main way astronomers determine the physical and chemical properties of an object in the distant universe is through
A) photography
B) spectroscopy
C) astrometry
D) direct measurement

Question

Quizplus · Accepted Answer

Spectroscopy is the study of the interaction of light with matter. By analyzing the spectrum of light emitted or absorbed by an object, astronomers can determine its physical and chemical properties such as temperature, composition, and velocity. Photography can provide useful information, but it only captures the object's appearance and does not reveal much about its properties. Astrometry involves measuring the position and motion of objects in the sky, which is important for studying the overall structure and evolution of the universe, but it does not provide direct information about an object's properties. Direct measurement is not possible for objects that are too far away, making spectroscopy the most valuable tool for studying the distant universe.

The Main Way Astronomers Determine the Physical and Chemical Properties