What factor primarily determines the lifespan of a star?

• Temperature
• Mass
• Luminosity
• Chemical composition

Why do larger stars die faster than smaller stars?

• They have less hydrogen fuel
• They have more gravitational forces leading to faster fusion
• They are cooler in temperature
• They emit more light

What is the remnant of a star like the Sun after it becomes a red giant?

• Neutron star
• Black hole
• White dwarf
• Black dwarf

What is the main sequence in the context of stars?

• A stage where stars are born
• A stage where stars are dying
• A stage where stars burn Hydrogen

• A type of star cluster

What color are the hottest stars on an HR diagram?

• Red
• Blue
• Yellow
• White

How does a star's position on the HR diagram change throughout its lifetime?

• It remains constant
• It moves from the main sequence to the red giant phase
• It moves from the red giant phase to the main sequence
• It moves randomly

What information do the axes on an HR diagram provide?

• Temperature and luminosity
• Mass and age
• Color and size
• Distance and brightness

What is the relationship between a star's color and its surface temperature?

• Red stars are the hottest
• Blue stars are the hottest
• Yellow stars are the coolest
• White stars are the coolest

How might the HR diagram for a young star cluster differ from that of an old star cluster?

• Young clusters have more red giants
• Old clusters have more main sequence stars
• Young clusters have more main sequence stars
• Old clusters have more blue stars

What type of star is likely to have a luminosity of 900 and a temperature of 6000 K?

• Red giant
• Main sequence star
• White dwarf
• Neutron star