Ultraviolet radiation with a wavelength shorter than about 200 nm is hard to observe primarily because
A) Earth's atmosphere easily absorbs it.
B) no space-based telescopes operate at ultraviolet wavelengths.
C) only the lowest-mass stars emit ultraviolet light.
D) very few objects emit at ultraviolet wavelengths.
E) Earth emits too much ultraviolet background light.

Question

Quizplus · Accepted Answer

Earth's atmosphere absorbs most ultraviolet radiation, especially at wavelengths shorter than 200 nm, making it difficult to observe from the ground.

Ultraviolet Radiation with a Wavelength Shorter Than About 200 Nm