Gravity
In which direction does Earth’s gravity pull?
Towards the center of Earth
Distances in space are so great, they are often measured in _________.
light years
Earth’s axis is an imaginary line that
goes from the North Pole to the South Pole.
What is a revolution and how long is Earth's revolution?
how long it takes a planet to revolve around the sun, the Earth’s revolution is 365.25
The force of gravity between two objects increases as they are
closer together
The sun has the highest apparent brightness to Earth because it
is closer to Earth than other stars
The sun rises in the _______.
East
What is an orbit?
-a curved path that an object makes around another object
The sun’s gravity is _________ Earth’s because the sun is _________ than Earth.
stronger; bigger
Why does only a small part of a star’s light reach Earth?
The light spreads out as it moves through space.
What causes day and night?
Earth rotates on its axis
Describe how the length of daytime changes from January to the start of summer.
Daylight increases
The moon’s gravity is weaker than Earth’s. If you went to the moon, you would jump ________
higher
______ and _______ impact apparent brightness of stars
Distance and size impact apparent brightness of stars
Why is the world divided into time zones?
The time the sun is at its peak differs from place to place.
Jamie wants to model the way Earth rotates on its axis. He asks his friend Maya to help. Jamie asks Maya to represent Earth in his model, while he represents the sun.
What should Jaime and Maya do in order to model the sun and Earth’s rotation?
Answers may vary
How does the sun’s gravity affect Earth?
Holds us into orbit
Cecily and her brother Michael locate the star Betelgeuse. Betelgeuse is located 643 light-years away from Earth. It is also at least ten times larger than our sun. Michael asks Cecily why Betelgeuse seems much smaller than our sun if it is so much larger than our sun.
What explanation can Cecily give to Michael to explain this phenomena?
Light rays from Betelgeuse must spread much farther than light rays from the sun before reaching Earth.
Which season has the fewest hours of daylight?
Winter
Amelia sits outside during lunch time and sees the sun directly overhead. The following day, she sees the sun in the exact same place in the sky.
Which of the following claims explains why Amelia sees the sun in the same place in the sky at the same time on different days?
Earth rotates on its axis once every 24 hours.