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75 Cards in this Set
- Front
- Back
True or False
A planet is a large, solid object that travels around a star. |
True
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True or False
All the planets are held in orbit by a force called gravity. |
True
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True or False
Earth has 40 moons. |
False
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True or False
Asteroids are made of gas. |
False
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True or False
Comets are found between the planets Mars and Jupiter. |
False
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The sun and the nine planets make up the ---- -----.
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solar system
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Each of the nine planets moves in a curved path around the sun called an
---. |
orbit
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Planets far from the sun have (large, small) orbits.
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large
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Each moon is held in orbit around a planet by the gravity between the moon and its ---.
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planet
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What are the names of the planets from the Sun outward.
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Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto
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What does the size of the orbit of a planet depend on?
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The size of a planet's orbit depends on the distance of the planet from the sun.
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How are all the planets held in orbit?
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All the planets are held in orbit by a force called gravity.
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Stars are huge balls of hot ---.
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gases
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The center of a star is so hot that the star gives off ---.
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light
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The --- is the star that is nearest Earth.
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sun
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The is is a --- sized star.
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medium
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The sun's diameter is --- times the diameter of Earth.
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100
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True or False
Some stars are too far away for us to see. |
True
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True or False
Stars are made up mostly of hydrogen and helium. |
True
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Most stars are nearer to Earth than the sun.
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False
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True or False
It takes 8 hours for the sun's light to reach Earth. |
False
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True or False
Plantes give off heat and light. |
False
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What are stars?
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Stars are huge balls of hot gases.
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Why does a star give off light?
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The center of a star is so hot that the star gives off light.
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How many stars are there?
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There are billions of stars.
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Why is the sun important to Earth?
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There would be no life on EArth without the sun.
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How are stars different from planets?
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Stars give off heat and light. Planets do not.
Planets and moons reflect light from the sun. |
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What is a pattern of stars called?
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Constellation
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What do two of the stars in the bowl of the Big Dipper point to?
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Polaris
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When you look at Polaris, in what direction are you facing?
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north
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How many constellations are there?
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88
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True or False
Many constellations are named after animals. |
True
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Ursa Major is a Latin name that means Great Bear.
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True
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True or False
Each constellation has a French name. |
False
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True or False
At the equator, you can see all of the constellations. |
True
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True or False
What constellation is the Big Dipper part of? |
The Big Dipper is part of a large constellation called Ursa Major.
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How have people used stars throughout history?
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Throughout history, people have used the positions of the stars to guide them as they traveled on land and sea.
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The four planets that are closest to the sun are called the --- planets.
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inner
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Earth is the --- planet from the sun.
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third
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Earth is the only planet with --- things.
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living
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Plants and animals on Earth need the water and --- to stay alive.
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atmosphere
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Which planet is the smallest?
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Mercury
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The surface of Earth is made up of soil and ---.
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rock
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Air is a mixture of many different ---.
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gases
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Earth gets light and heat from the ---.
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sun
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The sun shines directly on the part of Earth called the ---.
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equator
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Few living things can live in the cold temperatures near the ---.
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poles
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Three fourths of Earth's surface is covered by ---.
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water
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Not all parts of Earth get the same amount of ---.
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sunlight
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Many kids of plants and animals live in the --- parts of Earth.
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warmer
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The --- is the largest object in the night sky.
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moon
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The --- orbits around Earth.
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moon
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A --- is an object in space that orbits another object in space.
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satellite
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The changing views of the moon are called ---.
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phases
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The moon gives off no --- light of its own.
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light
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The moon is a --- of Earth.
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satellite
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The changes in the levels of the oceans are called ---.
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tides
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What causes tides?
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The moon's gravity pulls the waters of Earth toward the moon. This pull makes the level of the water in the oceans change.
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Why does the moon seem to change shape?
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The moon seems to change shape because different amounts of it are lit by the sun at different times. The
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What is the largest planet of the solar system?
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Jupiter
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Which planet is surrounded by shiny rings?
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Saturn
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The outer planets are (hotter, colder) than the inner planets.
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colder
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In what two ways are the outer planets different from Earth?
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They are very cold and may be made mainly of gas.
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How would the sun look from Pluto?
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From Pluto, the sun would probably look like a distant star.
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Astronauts have been to the --- several times.
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moon
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--- made by people can send photographs and other information back to Earth.
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Satellites
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--- is now traveling beyond our solar system.
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Voyager
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The time it takes Earth to orbit once around the sun is called a ---.
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year
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A year on Ear is --- days
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365 1/4
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In a leap year, February has -- days.
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29
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What is the imaginary line that goes through Earth from the North Pole to the South Pole called?
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Earth's axis
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Why does it seem that the sun is moving across the sky?
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The spinning motion of Earth makes the sun look like it is moving across the sky.
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What does Earth do once every 24 hours?
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Earth rotates once every 24 hours.
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What two things together cause the seasons?
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1. The movement of Earth around the sun.
2. The tilt of the Earth. |
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What happens when the North Pole is tilted toward the sun?
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The northern part of Earth has long days and short night. It is summer in the Northern Hemisphere.
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