What evidence can you cite that the interstellar medium contains both gas and dust? (Select all that apply.) (1)The dust of the interstellar medium can be detected from the emission lines of elements heavier than iron. (2)The dust of the interstellar medium can be detected by the extinction of light from distant stars. (3)The dust of the interstellar medium can be detected by the scattering of blue light from distant or embedded objects. (4)The gas of the interstellar medium can be detected from the radiation of ultraviolet photons. (5)The gas of the interstellar medium can be detected from the radiation of photons of wavelength 21 cm. (6)The gas of the interstellar medium can be detected from the absorption lines present in the light from distant stars, which must be caused by a medium of a density and temperature other than that of the stars emitting the light.

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What evidence can you cite that the interstellar medium contains both gas and dust? (Select all that apply.)

(1)The dust of the interstellar medium can be detected from the emission lines of elements heavier than iron.
(2)The dust of the interstellar medium can be detected by the extinction of light from distant stars.
(3)The dust of the interstellar medium can be detected by the scattering of blue light from distant or embedded objects.
(4)The gas of the interstellar medium can be detected from the radiation of ultraviolet photons.
(5)The gas of the interstellar medium can be detected from the radiation of photons of wavelength 21 cm.
(6)The gas of the interstellar medium can be detected from the absorption lines present in the light from distant stars, which must be caused by a medium of a density and temperature other than that of the stars emitting the light.
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