The rotation period of Uranus was measured through:
A) observations of the motions of its satellites.
B) observations of the features on its cloud surface.
C) observations of radio signals associated with its magnetosphere.
D) observations of its motion around the Sun.
E) observations of Neptune's motion around the Sun.
Question 2
Which of these is NOT a consequence of dust in the interstellar medium?
A) reddening of stars' light that passes through the dust
B) blue reflection nebulae around the Pleiades
C) red light from the emission nebulae
D) the dark nebulae that block 90 of the Milky Way from us visually
E) terrestrial planets like our own
