The Solar System

Which layer of the Sun has an average temperature of 5,500 °C (9,932 °F)?

• Core

• Photosphere

• Chromosphere

• Radiative Zone

Why does a stellar nebula become a protostar?

• Regions in the nebula collapse.

• Nuclear fusion begins with the heating of the core, converting its hydrogen atoms to helium atoms, changing its structure.

• The star cools down to an extremely low temperature, causing it to condense.

• The nebula becomes overfilled of energy.

What is the sun's diameter (To the nearest 10)?

What is the Sun's temperature? (°F)

"A star at the stage in its life cycle when it stops burning hydrogen, begins burning helium, and expands to a large, low-density star."
What stage in the life cycle does this describe? 

• Supernova
• Black Hole
• Main Sequence
• Red Giant or Red Supergiant

How many planets are there in our Solar System?

Give three examples of dwarf planets. (Example: DwarfPlanetA, DwarfPlanetB, DwarfPlanetC)

Give four examples of terrestrial planets. (In ascending order of distance from the sun.