Unit 5: The Universe Test Review

Front

What is the temperature of the coolest stars?

Back

The coolest stars have lower temperatures compared to others, often around 3,000°C.

Front

What phenomenon do scientists observe to conclude that the universe is expanding?

Back

Scientists observe redshift, which indicates that galaxies are moving away from us.

Front

What is the approximate surface temperature of the Sun?

Back

The approximate surface temperature of the Sun is 5,500°C.

Front

What type of galaxy is characterized by spiral arms?

Back

A spiral galaxy is characterized by its spiral arms.

Front

How would you describe stars that are dim but hotter?

Back

Stars that are dim and hotter are often found in specific regions of the Hertzsprung-Russell diagram.

Front

What is redshift?

Back

Redshift is the phenomenon where light from an object is shifted to longer wavelengths, indicating it is moving away.

Front

What is the difference between a spiral galaxy and an elliptical galaxy?

Back

A spiral galaxy has distinct arms, while an elliptical galaxy is more rounded and lacks structure.

Front

What is the significance of the Hertzsprung-Russell diagram?

Back

The Hertzsprung-Russell diagram classifies stars based on their luminosity and temperature.

Front

What are black holes?

Back

Black holes are regions in space where the gravitational pull is so strong that nothing, not even light, can escape.

Front

What is the main component of stars?

Back

The main component of stars is hydrogen, which undergoes nuclear fusion to produce energy.