1 movement in space
1. planets appear to move in the sky against the backdrop of
a. other planets. b. the sun.
c. the stars. d. the moon.
2. what object is at the center of the geocentric model?
a. earth b. the moon
c. the sun d. a star
3. what discovery by galileo supported the heliocentric model?
a. the phases of venus
b. the elliptical orbits of planets
c. the moon’s orbiting of earth
d. the movement of planets in the night sky
4. objects in the sky appear to move due to earth’s ______________ and ______________.
5. ccc cause and effect why do stars appear to move from east to west in the night sky?
_________________________________________
_________________________________________
_________________________________________
6. ccc patterns the constellation hercules is visible in the sky in september. why isn’t hercules visible in the sky in march?
_________________________________________
_________________________________________
_________________________________________
2 earth’s movements in space
7. the imaginary line that runs through earth’s pole is its
a. axis. b. orbit.
c. revolution. d. rotation.
8. which of the following is responsible for the cyclic pattern of day and night on earth?
a. the tilt of earth’s axis
b. the rotation of earth on its axis
c. earth’s revolution around the sun
d. the revolution of the moon around earth
9. earth has seasons because
a. its axis is tilted as it revolves around the sun.
b. it rotates on its axis as it revolves.
c. the moon exerts a gravitational force on it.
d. the relative positions of earth, the sun, and the moon do not change.
10. the two times of the year in which the sun is directly overhead at the equator are the ______________ and the ______________.
11. ccc patterns how does the distance between two objects affect the force of gravity between them?
_________________________________________
_________________________________________
12. ccc systems why is it generally warmer in the northern hemisphere in june than it is in december?
_________________________________________
_________________________________________
_________________________________________
376 earth - sun - moon system

Question

1 movement in space
1. planets appear to move in the sky against the backdrop of
a. other planets.  b. the sun.
c. the stars.  d. the moon.
2. what object is at the center of the geocentric model?
a. earth  b. the moon
c. the sun  d. a star
3. what discovery by galileo supported the heliocentric model?
a. the phases of venus
b. the elliptical orbits of planets
c. the moon’s orbiting of earth
d. the movement of planets in the night sky
4. objects in the sky appear to move due to earth’s ______________ and ______________.
5. ccc cause and effect why do stars appear to move from east to west in the night sky?
_________________________________________
_________________________________________
_________________________________________
6. ccc patterns the constellation hercules is visible in the sky in september. why isn’t hercules visible in the sky in march?
_________________________________________
_________________________________________
_________________________________________
2 earth’s movements in space
7. the imaginary line that runs through earth’s pole is its
a. axis.  b. orbit.
c. revolution.  d. rotation.
8. which of the following is responsible for the cyclic pattern of day and night on earth?
a. the tilt of earth’s axis
b. the rotation of earth on its axis
c. earth’s revolution around the sun
d. the revolution of the moon around earth
9. earth has seasons because
a. its axis is tilted as it revolves around the sun.
b. it rotates on its axis as it revolves.
c. the moon exerts a gravitational force on it.
d. the relative positions of earth, the sun, and the moon do not change.
10. the two times of the year in which the sun is directly overhead at the equator are the ______________ and the ______________.
11. ccc patterns how does the distance between two objects affect the force of gravity between them?
_________________________________________
_________________________________________
12. ccc systems why is it generally warmer in the northern hemisphere in june than it is in december?
_________________________________________
_________________________________________
_________________________________________
376 earth - sun - moon system

Accepted Answer

### Question 1
# Brief Explanations:
Planets move against the backdrop of stars as stars are relatively fixed (due to their great distance) and planets' orbits make them appear to move against this starry background. Other planets, the sun, or the moon don't serve as the main backdrop for planetary motion in the sky.
# Answer:
C. the stars

### Question 2
# Brief Explanations:
The geocentric model places Earth at the center of the universe, so Earth is at the center of this model. The moon orbits Earth, the sun is at the center of the heliocentric model, and a star isn't the center of the geocentric model.
# Answer:
A. Earth

### Question 3
# Brief Explanations:
Galileo's observation of Venus's phases supported the heliocentric model (sun - centered) because it showed Venus orbits the sun, not Earth. Elliptical orbits of planets were Kepler's discovery, the moon's orbit around Earth doesn't support heliocentrism, and planetary movement in the night sky alone doesn't prove heliocentrism.
# Answer:
A. the phases of Venus

### Question 4
# Brief Explanations:
Objects in the sky appear to move mainly due to Earth's rotation (causing daily apparent motion) and revolution (causing annual changes in positions of celestial objects). Rotation makes objects seem to move across the sky daily, and revolution changes their positions over the year.
# Answer:
rotation; revolution (or other appropriate terms related to Earth's motion like "orbit" for revolution, but rotation and revolution are the key motions here)

### Question 5
# Brief Explanations:
Stars appear to move from east to west because Earth rotates on its axis from west to east. As Earth spins, the stars (and other celestial objects) seem to move in the opposite direction, from east to west, similar to how the sun "rises" in the east and "sets" in the west due to Earth's rotation.
# Answer:
Stars appear to move from east to west in the night sky because Earth rotates on its axis from west to east. As Earth spins, the stars (and other celestial objects) seem to move across the sky in the opposite direction (east to west) relative to an observer on Earth.

### Question 6
# Brief Explanations:
The constellation Hercules isn't visible in March because of Earth's revolution around the sun. As Earth orbits the sun, the night - time side of Earth faces different parts of the sky throughout the year. In September, the night sky view includes Hercules, but in March, the position of Earth in its orbit means the night sky we see doesn't include Hercules (the part of the sky with Hercules is now in the daytime as seen from Earth or in a different direction due to the orbital motion).
# Answer:
The constellation Hercules is not visible in March because of Earth's revolution around the sun. As Earth orbits the sun, the portion of the sky that is visible at night changes throughout the year. In September, the night - time sky as seen from Earth includes the region with Hercules, but by March, Earth's position in its orbit has changed such that the part of the sky containing Hercules is no longer visible at night (either it is in the daytime sky or in a direction not visible from Earth's night - side at that time).

### Question 7
# Brief Explanations:
The imaginary line running through Earth's pole is its axis. An orbit is the path Earth takes around the sun, revolution is the movement around the sun, and rotation is the spinning on the axis (the axis is the line of rotation).
# Answer:
A. axis

### Question 8
# Brief Explanations:
The rotation of Earth on its axis causes the cycle of day (when a part of Earth faces the sun) and night (when it faces away from the sun). The tilt of Earth's axis causes seasons, revolution around the sun causes annual changes, and the moon's revolution around Earth affects tides and lunar phases, not day - night cycles.
# Answer:
B. the rotation of Earth on its axis

### Question 9
# Brief Explanations:
Earth has seasons because its axis is tilted as it revolves around the sun. This tilt causes different parts of Earth to receive different amounts of solar energy throughout the year. Rotation on its axis causes day - night, the moon's gravitational force causes tides, and the relative positions of Earth, sun, and moon do change (causing phases, eclipses, etc.).
# Answer:
A. its axis is tilted as it revolves around the sun

### Question 10
# Brief Explanations:
The two times when the sun is directly overhead at the equator are the spring equinox and the fall equinox (vernal equinox and autumnal equinox). During these equinoxes, the sun's rays are perpendicular to the equator, resulting in nearly equal day and night lengths globally.
# Answer:
vernal equinox (spring equinox); autumnal equinox (fall equinox)

### Question 11
# Brief Explanations:
According to Newton's law of universal gravitation, the force of gravity ($F$) between two objects is given by $F = G\frac{m_1m_2}{r^2}$, where $G$ is the gravitational constant, $m_1$ and $m_2$ are the masses of the two objects, and $r$ is the distance between their centers. As the distance $r$ between two objects increases, the gravitational force between them decreases, and as $r$ decreases, the gravitational force increases. This is an inverse - square relationship, meaning the force is inversely proportional to the square of the distance between the objects.
# Answer:
According to the law of universal gravitation ($F = G\frac{m_1m_2}{r^2}$), the force of gravity between two objects is inversely proportional to the square of the distance between them. As the distance between two objects increases, the gravitational force between them decreases, and as the distance decreases, the gravitational force increases.

### Question 12
# Brief Explanations:
In June, the Northern Hemisphere is tilted towards the sun. This tilt causes the Northern Hemisphere to receive more direct sunlight and more hours of daylight, leading to warmer temperatures. In December, the Northern Hemisphere is tilted away from the sun, receiving less direct sunlight and fewer hours of daylight, resulting in colder temperatures. The tilt of Earth's axis and its revolution around the sun cause this seasonal temperature difference.
# Answer:
It is generally warmer in the Northern Hemisphere in June than in December because in June, the Northern Hemisphere is tilted towards the sun. This tilt results in more direct sunlight and a longer period of daylight, which leads to more solar energy being absorbed and warmer temperatures. In December, the Northern Hemisphere is tilted away from the sun, receiving less direct sunlight and having shorter days, resulting in cooler temperatures.

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