Planet Vocabulary Practice

What is the Milky Way Galaxy?

• A single star in the universe

• A huge system of stars where our solar system is located

• A constellation visible from Earth

• The galaxy that is home to the planet Jupiter

Answer explanation

The Milky Way Galaxy is a huge system of stars where our solar system is located, making it the correct choice.

What defines a Solar System?

• A collection of moons orbiting a planet

• A group of comets and asteroids

• The gravitational bound system of the sun and the objects that orbit it

• A cluster of galaxies

Answer explanation

The correct choice is the gravitational bound system of the sun and the objects that orbit it, defining a Solar System.

Which of the following is true about the Sun?

• It is a small star at the edge of the solar system

• It is a medium-sized star at the center of our solar system

• It is the largest planet in our solar system

• It orbits around the Earth

Answer explanation

The Sun is a medium-sized star at the center of our solar system, not a small star at the edge or the largest planet. It does not orbit around the Earth.

What are Jovian planets known for?

• Having solid surfaces and being closest to the Sun

• Being the innermost layer of planets with heavy metal cores

• Having relatively small, dense cores surrounded by massive layers of gas

• Being the only planets with moons

Answer explanation

Jovian planets are known for having relatively small, dense cores surrounded by massive layers of gas.

Which characteristics are typical of Terrestrial planets?

• They are gas giants with no solid surface

• They have rings made of ice and rock

• They have compact, rocky surfaces and heavy metal cores

• They are located in the outermost layer of planets

Answer explanation

Terrestrial planets have compact, rocky surfaces and heavy metal cores, distinguishing them from gas giants or planets with ice and rock rings.

What is a Planet?

• A comet that orbits the Sun

• A large, round body that orbits a star

• A moon that orbits a planet

• A star at the center of a solar system

Answer explanation

A planet is a large, round body that orbits a star, making the second answer choice the correct one.

What is a Moon?

• A star that reflects light from the Sun

• A satellite that orbits the planet

• A planet that orbits a star

• A small galaxy

Answer explanation

A Moon is a satellite that orbits a planet, not a star, planet, or galaxy. It revolves around a celestial body, usually a planet, and reflects light from the Sun.

A giant structure that contains dust, gasses, and hundreds of billions of stars.

• Our solar system

• The universe

• A nebula

• A galaxy

A star and the celestial objects that orbit it.

• Solar System

• Galaxy

• Planet

• Cosmos

The Sun, eight planets, and thousands of stars make up the 

• outer planets
• inner planets
• solar system
• light years