The Sun

If the stars in our galaxy were ranked in order, increasing in size, our Sun would be _____

• well below the midpoint
• around the midpoint
• slightly above the midpoint
• in the top 10%

The vast majority of stars are _____

• red dwarfs
• yellow dwarfs
• yellow giants
• neutron stars

Compared to the diameter of the Earth, how wide is the Sun?

• 10 times wider
• 100 times wider
• 1,000 times wider
• 10,000 times wider

How many Earths could fit inside the Sun?

• about 13 thousand
• about 130 thousand
• about 1.3 million
• about 13 million

What is the temperature of the Sun's core?

• 15 thousand degrees Celsius
• 150 thousand degrees Celsius
• 1.5 million degrees Celsius
• 15 million degrees Celsius

In the Sun's core, hydrogen atoms fuse together to form the heavier element _____

• sodium
• helium
• iron
• uranium

How often does the Sun lose a mass equivalent to 15 Empire State Buildings?

• every second
• every minute
• every hour
• every day

In the Sun, where does hydrogen fusion occur?

• only in the core
• in the core and convective zone
• from the core out to the photosphere
• from the core out to the corona

Heat transfer by the buoyant motion of the Sun's heated gases is called _____ 

• conduction
• convection
• thermal radiation
• collusion

Which layer is thin enough to be transparent, and considered the Sun's surface?

• the convective zone
• the photosphere
• the chromosphere
• the corona