Unit 6 Review - Investigating the Universe

Front

What is the spectral class of a star with a temperature of 27,000 K?

Back

Spectral class B.

Front

What does the Hertzsprung-Russell diagram illustrate?

Back

It shows the relationship between the brightness and temperature of stars.

Front

What is the temperature relationship between red and blue stars?

Back

A red star has a cooler surface temperature than a blue star.

Front

What type of galaxy is characterized by a smooth, featureless light profile?

Back

Elliptical galaxy.

Front

What happens to a normal star as it burns through its fuel?

Back

It becomes cooler.

Front

What is the term for light waves that are stretched as a galaxy moves away from us?

Back

Red shifted.

Front

What is the main difference between spiral and elliptical galaxies?

Back

Spiral galaxies have distinct arms, while elliptical galaxies are more rounded and lack structure.

Front

What is the significance of a star's temperature in determining its spectral class?

Back

Temperature helps classify stars into spectral classes, which indicate their color and characteristics.

Front

What is the relationship between a star's brightness and its distance from Earth?

Back

The farther a star is, the dimmer it appears, even if it is intrinsically bright.

Front

What is a light-year?

Back

A light-year is the distance that light travels in one year, approximately 5.88 trillion miles.