Absorption lines due to interstellar gas
a. are wider than the lines from stars because the gas is hotter than most stars.
b. are more narrow than the lines from stars because the gas has a lower pressure than stars.
c. indicate that the interstellar medium contains dust.
d. indicate that the interstellar medium is expanding away from the sun.
e. none of the above
B
You might also like to view...
If the number of turns on the transformer input is greater than the number on the output, then the transformer
A. outputs greater voltage than at the input. B. outputs less current than at the input. C. outputs greater voltage and current than at the input. D. outputs less voltage than at the input. E. increases the voltage but does not affect the current.
When it is winter in the northern hemisphere, it is ____ in the southern hemisphere
a. winter b. summer c. spring d. fall
What information can we get from eclipsing binaries that we cannot get from visual binaries?
What will be an ideal response?
Which of the following is a safe assumption about all the stars in a star cluster?
A) They all have approximately the same surface temperature. B) They are all approximately the same distance away from us. C) They all have approximately the same mass. D) They will all have approximately the same lifetimes. E) They all have approximately the same apparent brightness in our sky.