Author Question: Uranus was discovered A) after examining perturbations in Neptune's orbit. B) less than 250 ... (Read 29 times)

burchfield96 · **on:** Jul 27, 2018

Uranus was discovered

A) after examining perturbations in Neptune's orbit.
B) less than 250 years ago.
C) thousands of years ago.
D) by Galileo.
E) with a radio telescope.

Question 2

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.