Telescopes operating at this wavelength must be cooled to observe faint astronomical objects.
A) radio
B) extreme infrared
C) visible
D) X-ray
E) gamma-ray
Answer: B
Telescopes operating at this wavelength must be cooled to observe faint astronomical objects.
A) radio
B) extreme infrared
C) visible
D) X-ray
E) gamma-ray
Answer: B