Question

question 7 (1 point)
which of the following characteristics of stars is represented on the hr diagram?
a temperature and age
b size and distance from earth
c mass (size) and brightness
d temperature and brightness

Explanation:

The Hertzsprung - Russell (HR) diagram is a scatter plot that represents stars. The x - axis of the HR diagram is related to the temperature (or spectral class) of the stars, and the y - axis is related to the brightness (luminosity or absolute magnitude) of the stars. Option a is incorrect because age is not a primary characteristic plotted on the HR diagram. Option b is incorrect as distance from Earth and size (in the way it's presented here) are not the main characteristics plotted. Option c is incorrect because while mass is related to size and can be inferred, the direct plot is of temperature and brightness (luminosity), not mass (size) and brightness in the way the option presents it. Option d correctly identifies that temperature (or spectral class related to temperature) and brightness (luminosity) are the characteristics represented on the HR diagram.

Answer:

d. temperature and brightness