The Solar System

What percentage of the Solar System's mass does the Sun make up?

• 50%

• 75%

• 99.8%

• 100%

Which of the following is NOT a terrestrial planet?

• Mercury

• Venus

• Earth

• Jupiter

The process by which hydrogen atoms fuse together to form helium is called ____.

• Combustion

• Nuclear fusion

• Photosynthesis

• Evaporation

The inner planets are smaller, rocky, and have few or no ____.

• Stars

• Moons

• Rings

• Oceans

The Solar System is located in which galaxy?

• Andromeda

• Milky Way

• Triangulum

• Whirlpool

What is the main component of the nebula from which the Solar System was formed?

• Helium

• Oxygen

• Hydrogen

• Carbon

Which of the following planets has no moons?

• Mercury

• Earth

• Mars

• Jupiter

Which planet is NOT considered an outer planet?

• Jupiter

• Saturn

• Mars

• Neptune

What is the only object in the asteroid belt with enough mass to have a spherical shape?

• Pluto

• Ceres

• Haumea

• Eris

What is the main composition of the outer planets Jupiter and Saturn?

• Metals and silicates

• Hydrogen and helium

• Water and ammonia

• Carbon dioxide and methane