The apparent angular shift of any object across a distant background, when viewed from two different places, is called ________ shift
Fill in the blank(s) with correct word
parallax or parallactic
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Cepheid variables are useful in measuring the distance to ____
a. globular clusters and dwarf galaxies around the Milky way, but nothing farther b. globular clusters and the Andromeda Galaxy, but not more distant objects c. galaxies that are within 30 megaparsecs, a relatively short distance d. galaxies that are moderately far away, up to about 500 megaparsecs e. galaxies and galactic clusters within a gigaparsec of the Milky Way
The force of gravity from one object extends to infinity never going to zero. When we say that gravitation is universal we mean that
a. the Earth exerts gravitational force on objects on its surface. b. the Earth exerts a gravitational force on its Moon and vice versa. c. the Earth, Moon, and Sun exert gravitational forces on each other. d. all material objects in the universe exert gravitational forces on one another.
Find the equation 
that fits the following data.
a. 
b. 
c. 
d. 
If distance is speed × time and light takes 1.3 seconds to travel from the Moon to Earth and 8 minutes to travel from the Sun to Earth, which of the following statements is true?
a. The Sun is 6.2 times further from Earth than the Moon. b. The Sun is 10 times further from Earth than the Moon. c. The Sun is 0.16 times further Earth than the Moon d. The Sun is 0.10 times further from Earth that the Moon. e. The Sun is 370 times further from Earth than the Moon.