Chapter 11: Lesson 1

Front

What is the largest object in the solar system?

Back

The Sun.

Front

Which of the following is an outer planet?

Back

Saturn.

Front

What is a comet?

Back

A comet is made of gas, dust, and ice; it moves in an oval-shaped orbit.

Front

What is a period of rotation?

Back

The time it takes for a planet to complete one full spin on its axis.

Front

What is an astronomical unit (AU)?

Back

The average distance from Earth to the Sun, about 150 million km.

Front

What are the inner planets?

Back

The inner planets are Mercury, Venus, Earth, and Mars.

Front

What are the outer planets?

Back

The outer planets are Jupiter, Saturn, Uranus, and Neptune.

Front

What is the difference between a planet and a dwarf planet?

Back

A planet clears its orbit of other debris, while a dwarf planet does not.

Front

What is the main component of the Sun?

Back

The Sun is primarily composed of hydrogen and helium.

Front

What is the significance of the Kuiper Belt?

Back

The Kuiper Belt is a region of the solar system beyond Neptune that contains many small icy bodies.