During a presentation on astronomy, Professor Williams discussed various measurements in space. Which objects was she referring to when she talked about how astronomical units (AU) were determined?
A B C D
the Sun and Earth the Moon and Earth the inner and outer planets the Sun and the closest star
Question: During a presentation on astronomy, Professor Williams discussed various measurements in space. Which objects was she referring to when she talked about how astronomical units (AU) were determined?
(A) the Sun and Earth
(B) the Moon and Earth
(C) the inner and outer planets
(D) the Sun and the closest star

Answer: (A) the Sun and Earth
Answer: (C) the inner and outer planets
Question: During a presentation on astronomy, Professor Williams discussed various measurements in space. Which objects was she referring to when she talked about how astronomical units (AU) were determined?
(A) the Sun and Earth
(B) the Moon and Earth
(C) the inner and outer planets
(D) the Sun and the closest star
Answer: (A) the Sun and Earth