Understanding Our Solar System

The __ of Earth is about 12,742 kilometers.

The force that attracts objects toward one another is called __.

A __ is a tool used to observe distant stars and planets.

Our moon has different __ over the course of a month.

A __ is an artificial object that orbits a planet.

What do we call a natural or artificial body that orbits a planet?

• Asteroid

• Satellite

• Meteor

• Nebula

Which of the following is a model used to represent the relative sizes of planets in the solar system?

• Scale

• Graph

• Chart

• Diagram

What phase occurs when the moon is completely illuminated as seen from Earth?

• New Moon

• First Quarter

• Full Moon

• Last Quarter

What is the term for a vehicle designed to travel in outer space?

• Jet

• Spacecraft

• Rover

• Shuttle

What is used to calculate the proportion between two quantities, such as the size of a planet compared to Earth?

• Ratio

• Fraction

• Equation

• Function