Multiple Choice
The 21-centimeter line is one of the most important wavelengths in radio astronomy.It is produced mainly in
A) emission nebulae.
B) neutral hydrogen.
C) ionized hydrogen.
D) hot O and B stars.
Correct Answer:
Verified
Correct Answer:
Verified
Related Questions
Q84: Which two parameters of star motion in
Q85: What is the general path of motion
Q87: The method used by Harlow Shapley in
Q88: Where is the solar system located in
Q90: Henrietta Leavitt found that the longer a
Q91: Dark streaks across the Milky Way from
Q92: Stars are evenly distributed across the spherical
Q93: The density wave that produces the spiral
Q94: The Sun is one of several<br>A) thousands
Q120: What does a spiral galaxy look like