What does redshift measure for a distant galaxy?

• Its age in years
• Its speed away from us
• Its number of stars

How does a standard candle give a distance?

• By comparing apparent and true brightness
• By measuring its temperature alone
• By counting its planets

Dividing distance by speed gives a rough cosmic age near how many billion years?

Answer: ______________

A galaxy sits ten times farther than its twin. How much dimmer does it look?

• Ten times dimmer
• One hundred times dimmer
• Equally bright

A Cepheid pulses slowly and a second one pulses fast. Which is truly brighter?

• The fast pulsing one
• Both are always equal
• The slowly pulsing one

What does the slope of the Hubble relation give?

• The present expansion rate
• The age of the oldest star
• The mass of the Milky Way

A student dates the universe from one nearby star alone. What is wrong?

• Stars cannot be dated at all
• The age needs the expansion ratio of distance to speed
• Nearby stars are always newborn

Every galaxy survey shows neighbors receding on all sides. What follows?

• Our galaxy sits at the exact center
• The surveys must be broken
• The expansion has no center to point at