Which statement about dark dust clouds is true?

Which statement about dark dust clouds is true?

A) They can be penetrated only with longer wavelengths such as radio and infrared.
B) They block the vast majority of radio waves from our Galaxy.
C) They comprise the majority of the mass of the Galaxy.
D) They can be penetrated only with shorter waves, such as UV and X-ray.
E) Hydrogen and helium are the chief absorbing and scattering agents.

Question 2

Who discovered the period-luminosity relationship, and why was it so critical?

What will be an ideal response?

Question 3

What happens to light passing through even thin clouds of dust?

A) The light that passes through them is blueshifted due to the cloud's approach.
B) Its motion causes all light to be redshifted as it passes through these clouds.
C) Its motion causes the light of stars beyond to twinkle.
D) Even a little can completely block all light, such as the Horsehead Nebula.
E) It dims and reddens the light of all more distant stars.

Question 4

Adams and Leverrier both predicted the position of Neptune, based on its effects on

A) the Sun. B) Saturn. C) Pluto. D) Jupiter. E) Uranus.

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Which statement about dark dust clouds is true?

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