Unit Test 4.1, 4.2, & 4.3 Review

Front

What does a star's color indicate?

Back

A star's color indicates its relative surface temperature and its spectral class.

Front

What type of star does the Sun become when its core contracts to ignite fusion?

Back

The Sun becomes a 'living' Main Sequence star.

Front

What is a galaxy?

Back

A galaxy is a huge collection of billions of stars, gas, dust, and dark matter that is held together by gravity.

Front

What happens to the Sun when it runs out of Hydrogen fuel?

Back

When the Sun runs out of Hydrogen fuel, it will become a 'dying' red giant over a period of 500 million years.

Front

What determines a star's brightness or luminosity?

Back

A star's brightness or luminosity is determined by its size and temperature.

Front

What is the life cycle stage of a star after it has exhausted its hydrogen fuel?

Back

After exhausting its hydrogen fuel, a star will enter the red giant phase.

Front

What is the main sequence phase in a star's life cycle?

Back

The main sequence phase is when a star is fusing hydrogen into helium in its core.

Front

What is the difference between a red giant and a red supergiant?

Back

A red giant is a star that has expanded and cooled after exhausting hydrogen, while a red supergiant is a much larger star that has gone through more extensive fusion processes.

Front

What role does gravity play in the formation of galaxies?

Back

Gravity holds together the billions of stars, gas, dust, and dark matter that make up a galaxy.

Front

What is luminosity?

Back

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