Solar System

Front 1

True or False

A planet is a large, solid object that travels around a star.

Back 1

True

Front 2

True or False
All the planets are held in orbit by a force called gravity.

Back 2

True

Front 3

True or False

Earth has 40 moons.

Back 3

False

Front 4

True or False

Asteroids are made of gas.

Back 4

False

Front 5

True or False

Comets are found between the planets Mars and Jupiter.

Back 5

False

Front 6

The sun and the nine planets make up the ---- -----.

Back 6

solar system

Front 7

Each of the nine planets moves in a curved path around the sun called an
---.

Back 7

orbit

Front 8

Planets far from the sun have (large, small) orbits.

Back 8

large

Front 9

Each moon is held in orbit around a planet by the gravity between the moon and its ---.

Back 9

planet

Front 10

What are the names of the planets from the Sun outward.

Back 10

Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto

Front 11

What does the size of the orbit of a planet depend on?

Back 11

The size of a planet's orbit depends on the distance of the planet from the sun.

Front 12

How are all the planets held in orbit?

Back 12

All the planets are held in orbit by a force called gravity.

Front 13

Stars are huge balls of hot ---.

Back 13

gases

Front 14

The center of a star is so hot that the star gives off ---.

Back 14

light

Front 15

The --- is the star that is nearest Earth.

Back 15

sun

Front 16

The is is a --- sized star.

Back 16

medium

Front 17

The sun's diameter is --- times the diameter of Earth.

Back 17

100

Front 18

True or False

Some stars are too far away for us to see.

Back 18

True

Front 19

True or False

Stars are made up mostly of hydrogen and helium.

Back 19

True

Front 20

Most stars are nearer to Earth than the sun.

Back 20

False

Front 21

True or False

It takes 8 hours for the sun's light to reach Earth.

Back 21

False

Front 22

True or False

Plantes give off heat and light.

Back 22

False

Front 23

What are stars?

Back 23

Stars are huge balls of hot gases.

Front 24

Why does a star give off light?

Back 24

The center of a star is so hot that the star gives off light.

Front 25

How many stars are there?

Back 25

There are billions of stars.

Front 26

Why is the sun important to Earth?

Back 26

There would be no life on EArth without the sun.

Front 27

How are stars different from planets?

Back 27

Stars give off heat and light. Planets do not.

Planets and moons reflect light from the sun.

Front 28

What is a pattern of stars called?

Back 28

Constellation

Front 29

What do two of the stars in the bowl of the Big Dipper point to?

Back 29

Polaris

Front 30

When you look at Polaris, in what direction are you facing?

Back 30

north

Front 31

How many constellations are there?

Back 31

88

Front 32

True or False

Many constellations are named after animals.

Back 32

True

Front 33

Ursa Major is a Latin name that means Great Bear.

Back 33

True

Front 34

True or False

Each constellation has a French name.

Back 34

False

Front 35

True or False

At the equator, you can see all of the constellations.

Back 35

True

Front 36

True or False
What constellation is the Big Dipper part of?

Back 36

The Big Dipper is part of a large constellation called Ursa Major.

Front 37

How have people used stars throughout history?

Back 37

Throughout history, people have used the positions of the stars to guide them as they traveled on land and sea.

Front 38

The four planets that are closest to the sun are called the --- planets.

Back 38

inner

Front 39

Earth is the --- planet from the sun.

Back 39

third

Front 40

Earth is the only planet with --- things.

Back 40

living

Front 41

Plants and animals on Earth need the water and --- to stay alive.

Back 41

atmosphere

Front 42

Which planet is the smallest?

Back 42

Mercury

Front 43

The surface of Earth is made up of soil and ---.

Back 43

rock

Front 44

Air is a mixture of many different ---.

Back 44

gases

Front 45

Earth gets light and heat from the ---.

Back 45

sun

Front 46

The sun shines directly on the part of Earth called the ---.

Back 46

equator

Front 47

Few living things can live in the cold temperatures near the ---.

Back 47

poles

Front 48

Three fourths of Earth's surface is covered by ---.

Back 48

water

Front 49

Not all parts of Earth get the same amount of ---.

Back 49

sunlight

Front 50

Many kids of plants and animals live in the --- parts of Earth.

Back 50

warmer

Front 51

The --- is the largest object in the night sky.

Back 51

moon

Front 52

The --- orbits around Earth.

Back 52

moon

Front 53

A --- is an object in space that orbits another object in space.

Back 53

satellite

Front 54

The changing views of the moon are called ---.

Back 54

phases

Front 55

The moon gives off no --- light of its own.

Back 55

light

Front 56

The moon is a --- of Earth.

Back 56

satellite

Front 57

The changes in the levels of the oceans are called ---.

Back 57

tides

Front 58

What causes tides?

Back 58

The moon's gravity pulls the waters of Earth toward the moon. This pull makes the level of the water in the oceans change.

Front 59

Why does the moon seem to change shape?

Back 59

The moon seems to change shape because different amounts of it are lit by the sun at different times. The

Front 60

What is the largest planet of the solar system?

Back 60

Jupiter

Front 61

Which planet is surrounded by shiny rings?

Back 61

Saturn

Front 62

The outer planets are (hotter, colder) than the inner planets.

Back 62

colder

Front 63

In what two ways are the outer planets different from Earth?

Back 63

They are very cold and may be made mainly of gas.

Front 64

How would the sun look from Pluto?

Back 64

From Pluto, the sun would probably look like a distant star.

Front 65

Astronauts have been to the --- several times.

Back 65

moon

Front 66

--- made by people can send photographs and other information back to Earth.

Back 66

Satellites

Front 67

--- is now traveling beyond our solar system.

Back 67

Voyager

Front 68

The time it takes Earth to orbit once around the sun is called a ---.

Back 68

year

Front 69

A year on Ear is --- days

Back 69

365 1/4

Front 70

In a leap year, February has -- days.

Back 70

29

Front 71

What is the imaginary line that goes through Earth from the North Pole to the South Pole called?

Back 71

Earth's axis

Front 72

Why does it seem that the sun is moving across the sky?

Back 72

The spinning motion of Earth makes the sun look like it is moving across the sky.

Front 73

What does Earth do once every 24 hours?

Back 73

Earth rotates once every 24 hours.

Front 74

What two things together cause the seasons?

Back 74

1. The movement of Earth around the sun.

2. The tilt of the Earth.

Front 75

What happens when the North Pole is tilted toward the sun?

Back 75

The northern part of Earth has long days and short night. It is summer in the Northern Hemisphere.