Ch. 2 Test Review

Front

What is the hottest type of star?

Back

A blue main sequence star is the hottest type of star.

Front

Which type of galaxy contains many old, red stars?

Back

Elliptical galaxies have many old, red stars.

Front

What theory explains that the universe began from a single point?

Back

The Big Bang theory states that the universe began from a single point.

Front

What property is NOT used to classify stars?

Back

Location is not used by scientists to classify stars.

Front

What does the Hertzsprung-Russell diagram plot?

Back

The Hertzsprung-Russell diagram plots the luminosity and temperature of stars.

Front

What is a white dwarf?

Back

A white dwarf is a small, dense star that is the remnant of a low or medium mass star.

Front

What is a blue main sequence star?

Back

A blue main sequence star is a hot, luminous star that is in the main phase of its life cycle.

Front

What are spiral galaxies?

Back

Spiral galaxies are galaxies characterized by their spiral arms and contain both young and old stars.

Front

What are irregular galaxies?

Back

Irregular galaxies are galaxies that do not have a distinct regular shape and often contain young stars.

Front

What is luminosity?

Back

Luminosity is the total amount of energy emitted by a star per second.