astronomy chapter 2 quiz 1
How would a star's parallax change as its distance from Earth increases?
The parallax shift decreases as the star's distance from Earth increases
Lunar eclipses can occur only during a _________.
full moon
If we have a new moon today, when we will have the next full moon?
in about two weeks
What do astronomers mean by a constellation?
A constellation is a region in the sky as seen from Earth.
What is really happening in space during the periods when we see Mars going through apparent retrograde motion?
Earth is passing by Mars in its orbit around the Sun.
The Sun-centered system pictured in the lower window of the video offers a simple explanation for observations of apparent retrograde motion. Should these facts alone have been enough to convince the ancient Greeks that Earth really does go around the Sun?
No, because the Greeks had an Earth-centered model that also accounted for apparent retrograde motion.
Which of the following celestial objects do NOT rise in the east and set in the west, as viewed from the Earth? (Assume that all of these objects are visible from your location on Earth, and that none of them are circumpolar.)
The angular distance between those two bright stars in the sky is about 2 meters
Which of the following best describes why we have seasons on Earth?
The tilt of Earth's axis causes different portions of Earth to receive more or less direct sunlight at different times of year.
Stars that are visible in the local sky on any clear night of the year, at any time of the night, are called _________.
circumpolar
During the time that a planet is in its period of apparent retrograde motion, _________.
over many days or weeks, the planet moves westward relative to the stars, rather than the usual eastward relative to the stars
What is the ecliptic?
the path the Sun appears to trace around the celestial sphere each year
