Study your flashcards anywhere!

Download the official Cram app for free >

  • Shuffle
    Toggle On
    Toggle Off
  • Alphabetize
    Toggle On
    Toggle Off
  • Front First
    Toggle On
    Toggle Off
  • Both Sides
    Toggle On
    Toggle Off
  • Read
    Toggle On
    Toggle Off
Reading...
Front

How to study your flashcards.

Right/Left arrow keys: Navigate between flashcards.right arrow keyleft arrow key

Up/Down arrow keys: Flip the card between the front and back.down keyup key

H key: Show hint (3rd side).h key

A key: Read text to speech.a key

image

Play button

image

Play button

image

Progress

1/75

Click to flip

75 Cards in this Set

  • Front
  • Back
True or False

A planet is a large, solid object that travels around a star.
True
True or False
All the planets are held in orbit by a force called gravity.
True
True or False

Earth has 40 moons.
False
True or False

Asteroids are made of gas.
False
True or False

Comets are found between the planets Mars and Jupiter.
False
The sun and the nine planets make up the ---- -----.
solar system
Each of the nine planets moves in a curved path around the sun called an
---.
orbit
Planets far from the sun have (large, small) orbits.
large
Each moon is held in orbit around a planet by the gravity between the moon and its ---.
planet
What are the names of the planets from the Sun outward.
Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto
What does the size of the orbit of a planet depend on?
The size of a planet's orbit depends on the distance of the planet from the sun.
How are all the planets held in orbit?
All the planets are held in orbit by a force called gravity.
Stars are huge balls of hot ---.
gases
The center of a star is so hot that the star gives off ---.
light
The --- is the star that is nearest Earth.
sun
The is is a --- sized star.
medium
The sun's diameter is --- times the diameter of Earth.
100
True or False

Some stars are too far away for us to see.
True
True or False

Stars are made up mostly of hydrogen and helium.
True
Most stars are nearer to Earth than the sun.
False
True or False

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

Plantes give off heat and light.
False
What are stars?
Stars are huge balls of hot gases.
Why does a star give off light?
The center of a star is so hot that the star gives off light.
How many stars are there?
There are billions of stars.
Why is the sun important to Earth?
There would be no life on EArth without the sun.
How are stars different from planets?
Stars give off heat and light. Planets do not.

Planets and moons reflect light from the sun.
What is a pattern of stars called?
Constellation
What do two of the stars in the bowl of the Big Dipper point to?
Polaris
When you look at Polaris, in what direction are you facing?
north
How many constellations are there?
88
True or False

Many constellations are named after animals.
True
Ursa Major is a Latin name that means Great Bear.
True
True or False

Each constellation has a French name.
False
True or False

At the equator, you can see all of the constellations.
True
True or False
What constellation is the Big Dipper part of?
The Big Dipper is part of a large constellation called Ursa Major.
How have people used stars throughout history?
Throughout history, people have used the positions of the stars to guide them as they traveled on land and sea.
The four planets that are closest to the sun are called the --- planets.
inner
Earth is the --- planet from the sun.
third
Earth is the only planet with --- things.
living
Plants and animals on Earth need the water and --- to stay alive.
atmosphere
Which planet is the smallest?
Mercury
The surface of Earth is made up of soil and ---.
rock
Air is a mixture of many different ---.
gases
Earth gets light and heat from the ---.
sun
The sun shines directly on the part of Earth called the ---.
equator
Few living things can live in the cold temperatures near the ---.
poles
Three fourths of Earth's surface is covered by ---.
water
Not all parts of Earth get the same amount of ---.
sunlight
Many kids of plants and animals live in the --- parts of Earth.
warmer
The --- is the largest object in the night sky.
moon
The --- orbits around Earth.
moon
A --- is an object in space that orbits another object in space.
satellite
The changing views of the moon are called ---.
phases
The moon gives off no --- light of its own.
light
The moon is a --- of Earth.
satellite
The changes in the levels of the oceans are called ---.
tides
What causes tides?
The moon's gravity pulls the waters of Earth toward the moon. This pull makes the level of the water in the oceans change.
Why does the moon seem to change shape?
The moon seems to change shape because different amounts of it are lit by the sun at different times. The
What is the largest planet of the solar system?
Jupiter
Which planet is surrounded by shiny rings?
Saturn
The outer planets are (hotter, colder) than the inner planets.
colder
In what two ways are the outer planets different from Earth?
They are very cold and may be made mainly of gas.
How would the sun look from Pluto?
From Pluto, the sun would probably look like a distant star.
Astronauts have been to the --- several times.
moon
--- made by people can send photographs and other information back to Earth.
Satellites
--- is now traveling beyond our solar system.
Voyager
The time it takes Earth to orbit once around the sun is called a ---.
year
A year on Ear is --- days
365 1/4
In a leap year, February has -- days.
29
What is the imaginary line that goes through Earth from the North Pole to the South Pole called?
Earth's axis
Why does it seem that the sun is moving across the sky?
The spinning motion of Earth makes the sun look like it is moving across the sky.
What does Earth do once every 24 hours?
Earth rotates once every 24 hours.
What two things together cause the seasons?
1. The movement of Earth around the sun.

2. The tilt of the Earth.
What happens when the North Pole is tilted toward the sun?
The northern part of Earth has long days and short night. It is summer in the Northern Hemisphere.