Question

why is the sky orange and red at sunrise and sunset?
gases absorb orange and red light.
blue wavelengths are absorbed by the atmosphere.
the thick atmosphere scatters all but longer wavelengths.
only short wavelengths are radiated from the sun in the morning and evening.

Explanation:

At sunrise and sunset, the Sun's light travels through a thicker layer of the atmosphere. Shorter - wavelength blue light is scattered more, while longer - wavelength orange and red light is scattered less. The thick atmosphere scatters all but longer wavelengths.

Answer:

The thick atmosphere scatters all but longer wavelengths.