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

Question

Quizplus · Accepted Answer

Telescopes operating in extreme infrared (also known as far infrared) wavelengths must be cooled to observe faint astronomical objects because their detectors are sensitive to heat and can be overwhelmed by the telescope's own thermal radiation if not cooled.

Telescopes Operating at This Wavelength Must Be Cooled to Observe