Which best describes a galaxy?

• a system containing dust, gas, and stars
• a few stars that form patterns in the sky
• a collection of all the stars in the universe
• a group of planets that revolve around a star

What is the order of planets in the solar system starting with closest to the sun?

• Mars, Venus, Earth, Mercury, Jupiter, Saturn, Uranus, Neptune
• Neptune,Uranus, Saturn, Jupiter, Mars, Earth, Venus, Mercury
• Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune
• Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus

What is the name for rocky objects that orbit the sun?

• asteroids
• stars
• comets
• moons

Which object is round, orbits the sun, and is larger than an asteroid?

• comet
• dwarf planet
• moon
  moon
• planet

Which object in Earth's solar system can also be called a gas giant?

• inner planets
• star
• comet
• outer planet

Which group does Earth belong to?

• outer planets
• asteroid belt
• solar system
• gas giants

Which of these formed from a ball of gas and dust?

• star
• planet
• universe
• galaxy

Which of these best describes a comet?

• a dwarf planet that orbits the sun
• a moon that travels through the universe
• a rocky object that orbits a planet
• a ball of ice and rock with a trail of gas and dust

Which is NOT a type of galaxy?

• spiral
• elliptical
• irregular
• circular

What galaxy do we live in?

• Milky Way
• Starburst
• Messier