The Sun Test

The sun's _________ is so powerful that it holds the planets in orbit.

• inertia
• gravity
• energy
• light

The sun contains _______ of the mass of the solar system.

• 89.8%
• 89.9%
• 50%
• 99.8%

The sun's mass is made up mostly of 

• helium and nitrogen
• helium and hydrogen
• oxygen and hydrogen
• oxygen and helium

The sun produces energy by

• attracting it with the forces of gravity
• light
• nuclear helium
• nuclear fusion

Nuclear fusion occurs in the sun's 

• photosphere
• core
• chromosphere
• corona

During nuclear fusion there is a change in MASS.  The change in MASS occurs because some of the matter is converted(changed) into

• heat and light energy
• gravity
• inertia
• speed

In the process of NUCLEAR FUSION

• helium is burned to release energy
• hydrogen is burned to release energy
• helium atoms join together to form hydrogen, releasing energy
• hydrogen atoms join together to form helium, releasing energy

Nuclear fusion occurs only under conditions of 

• high pressure and high temperature
• high pressure and low temperature
• low pressure and high temperature
• low pressure and low temperature

Three PRODUCTS of nuclear fusion are

• helium, hydrogen, and explosions
• hydrogen, light, and heat
• helium, light, and heat
• heat, light, and gaseous energy

There is enough fuel remaining in the sun to last  another 

• 10 million
• 5 billion
• 10 billion
• 5 million