Multiple Choice
Radiation with a wavelength of 21-cm is produced by
A) the hot gas of the interstellar medium.
B) HI regions.
C) molecular hydrogen.
D) emission nebulae.
E) b and d
Correct Answer:
Verified
Correct Answer:
Verified
Related Questions
Q27: Which of the following is evidence of
Q28: Which of the following is evidence of
Q29: Coronal gas<br>A) causes stars to look bluer
Q30: Extinction by the interstellar medium dims starlight
Q32: The local bubble<br>A) is a high temperature
Q33: The sky appears blue during the day
Q35: Extinction by the interstellar medium dims starlight
Q36: The composition of the interstellar dust suggests
Q73: The thermal motions of the atoms in
Q131: The dust in the interstellar medium can