ASTR 100 Exam 1 Questions with Correct Answers Latest Update 2025/2026
A theory, in science, is a guess about what might be true. - Answers False
Once a theory is proved in science, scientists stop testing it. - Answers False
The sun is a part of
a. The Solar System
b. The Milky Way Galaxy
c. The Universe
d. All of the Above - Answers d. All of the Above
A light-year is a measurement of
a. Distance
b. Speed
c. Mass
d. Time - Answers a. Distance
The average distance from Earth to the Moon is 384,000 km.
a. How many hours would it take, traveling at 800 kilometers per hour (km/h) -the typical speed
of a jetcraft- to reach the Moon?
b. How many days is this? - Answers Formula: T=D/V
a. 480 hours
b. 20 days
The Celestial sphere is not an actual object in the sky. - Answers True
The phases of the Moon are caused by the relative position of Earth, the Moon, and the Sun. -
Answers True
Which stars do we see at night depend on? (select all that apply)
a. our location on Earth
b. earth's location in orbit
c. the time of the observation
, d. the motion of stars relative to one another over the course of the year - Answers a. our
location on Earth
b. earth's location in orbit
c. the time of the observation
You see the Moon rising just as the Sun is setting. What phase is it in?
a. Waxing Crescent
b. Waning Crescent
c. Full Moon
d. New Moon
e. 1st Quarter
f. 3rd Quarter - Answers c. Full Moon
On the vernal and autumnal equinoxes,
a. The sun is located on the celestial equator.
b. All of the above.
c. The entire Earth has 12 hours of daylight and 12 hours of darkness.
d. The sun rises due east and sets due west.
e. None of the above. - Answers b. All of the above
We always see the same side of the Moon because
a. The moon rotates once each revolution.
b. None of these options.
c. When the other side of the moon is facing towards us, it is unlit.
d. The moon does not rotate on its axis. - Answers a. The moon rotates once each revolution.
Suppose you are on a plane from Santiago, Chile to Dallas, Texas. On the way there, you realize
something amazing. You have just experienced the longest day of the year in the Southern
Hemisphere and are about to experience the shortest day of the year in the Northern
Hemisphere on the same day! On what day of the year are you flying? - Answers December 21
Earth is 1 astronomical unit from the Sun. Light covers that distance in 8.3 minutes.
A theory, in science, is a guess about what might be true. - Answers False
Once a theory is proved in science, scientists stop testing it. - Answers False
The sun is a part of
a. The Solar System
b. The Milky Way Galaxy
c. The Universe
d. All of the Above - Answers d. All of the Above
A light-year is a measurement of
a. Distance
b. Speed
c. Mass
d. Time - Answers a. Distance
The average distance from Earth to the Moon is 384,000 km.
a. How many hours would it take, traveling at 800 kilometers per hour (km/h) -the typical speed
of a jetcraft- to reach the Moon?
b. How many days is this? - Answers Formula: T=D/V
a. 480 hours
b. 20 days
The Celestial sphere is not an actual object in the sky. - Answers True
The phases of the Moon are caused by the relative position of Earth, the Moon, and the Sun. -
Answers True
Which stars do we see at night depend on? (select all that apply)
a. our location on Earth
b. earth's location in orbit
c. the time of the observation
, d. the motion of stars relative to one another over the course of the year - Answers a. our
location on Earth
b. earth's location in orbit
c. the time of the observation
You see the Moon rising just as the Sun is setting. What phase is it in?
a. Waxing Crescent
b. Waning Crescent
c. Full Moon
d. New Moon
e. 1st Quarter
f. 3rd Quarter - Answers c. Full Moon
On the vernal and autumnal equinoxes,
a. The sun is located on the celestial equator.
b. All of the above.
c. The entire Earth has 12 hours of daylight and 12 hours of darkness.
d. The sun rises due east and sets due west.
e. None of the above. - Answers b. All of the above
We always see the same side of the Moon because
a. The moon rotates once each revolution.
b. None of these options.
c. When the other side of the moon is facing towards us, it is unlit.
d. The moon does not rotate on its axis. - Answers a. The moon rotates once each revolution.
Suppose you are on a plane from Santiago, Chile to Dallas, Texas. On the way there, you realize
something amazing. You have just experienced the longest day of the year in the Southern
Hemisphere and are about to experience the shortest day of the year in the Northern
Hemisphere on the same day! On what day of the year are you flying? - Answers December 21
Earth is 1 astronomical unit from the Sun. Light covers that distance in 8.3 minutes.
