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100
Why is Earth the only planet that can sustain a wide variety of life?
Moderate temperatures and liquid water
100
What type of galaxy is our Solar System?
Barred Spiral
100
As the Earth is spinning around the Sun, it is also spinning on its axis. This is also called the _____ of the Earth.
Rotation
100
Which are known as the outer planets?
Jupiter, Saturn, Uranus, Neptune, Pluto
100
Which planets are larger than Earth?
Jupiter, Saturn, Uranus, Neptune
200
Why can't a person see the entire Milky Way from Earth?
Earth is inside this galaxy
200
What types of galaxies do these pictures represent?
Spiral, Elliptical, Irregular
200
Saturn is the _______ planet from the Sun.
Sixth
200
Pieces of rock made of minerals similar to those that formed rocky planets and moons are known as ______.
Asteroids
200
Earth's tilt and its revolution around the Sun causes ________.
Seasons
300
Which planet spins backwards?
Venus
300
List the planets that are larger than Earth.
Jupiter, Saturn, Uranus, Neptune
300
What is not a description of a comet?
Began as huge clouds of gas and dust
300
Which are known as the inner planets?
Mercury, Earth, Mars, and Venus
300
The distance between the Earth and the Sun is measured in a(n)
Astronomical Unit
400
Asteroids orbit the Sun between ______ and ______
Mars, Jupiter
400
If it takes the inner planets _____ time to revolve around the Sun; it can be inferred that planets that are farther away from the Sun take ______ to revolve around it.
Less, Longer
400
The outer planets are classified as _______ planets.
Gas Giant
400
What is true about Venus?
Its surface is surrounded by thick clouds
400
Mars is often called the Red Planet. What causes its surface to appear red?
Iron oxide, known as rust, is found in the rocks
500
It takes Venus approximately ______ Earth ______ to orbit the Sun.
225, Days
500
Uranus rotates in which direction?
East to West
500
Scientists hypothesize that stars begin their lives as ________.
Huge clouds of gas and dust
500
How many spacecrafts have been launched to explore the Moon?
More than 100
500
A ______ is the dark, cooler region of the photosphere on the Sun's surface.
Sunspot
600
A group of stars that form a pattern in the sky are known as a
Constellation
600
Jupiter has the ______ day.
Shortest
600
How many planets in our solar system have rings?
4
600
All of the inner planets are considered ______ planets.
Terrestrial
600
What is not true about Mercury?
It is Earth's closest neighbor