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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