Gravity
What force pulls objects together?
Gravity
What causes the Moon to appear to change shape?
Seeing different parts of the Moon lit by the Sun
What is rotation?
Spinning on an axis
What causes seasons on Earth?
Earth's tilt and revolution
What is an axis?
an imaginary line Earth spins on
What keeps planets orbiting around the Sun?
the Sun's gravity
How long does the Moon take to complete one cycle of phases?
28 days
How long does Earth’s rotation take?
24 hours
Why do different places on Earth have different seasons?
Different parts receive different amounts of sunlight
During what moon phase is half of the Moon lit and one-quarter through its orbit?
First Quarter
Why don’t humans float away from Earth?
Earth's gravity
During which moon phase is the entire lit side visible?
Full Moon
What does Earth’s rotation cause?
day and night
What is a season?
A time of year caused by Earth’s tilt and revolution
What object orbits Earth?
The Moon
Which has stronger gravity: a larger object or a smaller object?
Larger object
During which moon phase does the Moon appear dark?
New Moon
What is revolution?
Moving around another object?
Does Earth’s tilt or gravity cause seasons?
Earth's tilt
What is the path one object takes around another?
Orbit
How does gravity keep our solar system in order?
Gravity keeps planets and moons in orbit
What is the Moon’s source of light?
Reflected light from The Sun
How long does Earth’s revolution around the Sun take?
365 days (1 year)
Why is it summer in one hemisphere while it is winter in the other?
because one hemisphere receives more direct sunlight
What are the four main moon phases?
New Moon, First Quarter, Full Moon, and Last Quarter