Moon, Earth, Sun Unit Flashcards
What do people call a group of stars?
constellation
What is earth’s annual motion around the sun?
revolution
how many days does it take for the Earth to go around the sun?
365
How long does it take Earth to rotate once?
24 hours or 1 day
The moon is what fraction of the Earth?
1/4
The calendar we used is based on what?
The seasons or how long it takes Earth to go around sun once
The tendency of an object to resist a change in motion is…
inertia
The tilting of the Earth causes what?
seasons
The force of gravity between 2 objects depends on what 2 things?
mass and distance
What 2 things keep the Earth in orbit around the sun and the moon in orbit around the Earth?
gravity and inertia
What causes the changes in the appearance of the moon?
The position of the Earth, sun and moon
What order are the Earth, sun and moon during a lunar eclipse?
sun, Earth, moon
What order are the Earth, sun and moon during a solar eclipse?
Sun, moon, Earth
The sun is how many times bigger than the Earth?
1000
The sun is how many times bigger than the moon?
4000
What causes tides to happen?
Gravity or gravitational pull from the moon
What caused the moon’s craters?
meteoroids
A streak of light produced when a small object burns up
meteor
A giant ball of hot gas made of hydrogen and helium
star
The amount of matter in an object
mass
the rise and fall of the ocean
tide
an object that orbits the sun and has been rounded by gravity
planets
a line passing through the Earth’s center and poles
axis
movement of Earth around it’s axis
rotation
the path of Earth as it revolves around the sun
orbit
a body that orbits a planet
satellite
a push or a pull
force
an object at rest stays at rest and an object in motion stays in motion unless acted upon by a force
Newton’s 1st law of motion
the different shapes of the moon are called…
phases
a large, round pit caused by a meteoroid
crater
