Understanding Stars

What is a star primarily made of?

• Water and air

• Iron and nickel

• Carbon and oxygen

• Hydrogen and helium

What process allows stars to create energy?

• Photosynthesis

• Combustion

• Evaporation

• Nuclear fusion

What happens to hydrogen molecules during nuclear fusion?

• They freeze

• They evaporate

• They fuse together

• They split apart

What is the term used by astronomers to describe a star's true brightness?

• Radiance

• Luminosity

• Apparent brightness

• Glow

How do astronomers measure a star's true brightness?

• By its color

• By its size

• By its distance from Earth

• By its luminosity

What is apparent brightness?

• The brightness of a star as seen from Earth

• The size of a star

• The temperature of a star

• The color of a star

Which factor is more important for apparent brightness?

• Distance

• Temperature

• Size

• Color

Which star is more luminous, Betelgeuse or the Sun?

• Neither

• The Sun

• They are the same

• Betelgeuse

Why does the Sun appear brighter to us than Betelgeuse?

• The Sun is closer

• Betelgeuse is farther

• The Sun is larger

• Betelgeuse is dimmer

How many times more luminous is Betelgeuse compared to the Sun?

• 10 times

• 100 times

• 1,000 times

• 100,000 times