Astronomy - Solar System - Final Review

Front

What causes retrograde motion of the planets?

Back

As Earth passes a planet, it appears to move backwards.

Front

What is a key difference between inner planets and outer planets?

Back

Outer planets have more rings and more moons.

Front

Why does the moon's phases change throughout the month?

Back

The Moon revolves around the Earth.

Front

Which of the following is NOT a characteristic of a planet?

Back

At least the size of Earth.

Front

Why does Mars appear to be red?

Back

Red soil due to the iron oxide.

Front

What is the definition of a planet?

Back

A celestial body that orbits the Sun, is round, and has cleared its orbit.

Front

What is perihelion?

Back

The point in a planet's orbit where it is closest to the Sun.

Front

What is aphelion?

Back

The point in a planet's orbit where it is farthest from the Sun.

Front

What is the significance of the asteroid belt?

Back

It separates the inner rocky planets from the outer gas giants.

Front

What is the primary reason for the seasons on Earth?

Back

The tilt of Earth's axis as it orbits the Sun.