Astronomers Use the Term Interstellar Extinction to Refer To

Multiple Choice

Astronomers use the term interstellar extinction to refer to:

A) the death of the dinosaurs and other species from the collision of an asteroid with the Earth
B) the death of a massive star when it explodes
C) the ionization of a region of hydrogen around an extremely hot star
D) the absorption of radio waves at 21-cm by cold hydrogen atoms
E) the scattering and absorption of starlight by dust grains in space