Unit 6 Review - Investigating the Universe

Front

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

Back

Spectral class B.

Front

What is the classification of a star with a temperature of 20,000 K and a brightness of 1?

Back

White dwarf.

Front

What did Hubble notice about the movement of galaxies?

Back

Galaxies were moving farther away.

Front

What type of galaxy is characterized by a lack of a defined shape?

Back

Irregular galaxy.

Front

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

Back

It becomes cooler.

Front

What is the temperature range for spectral class A stars?

Back

7,500 K to 10,000 K.

Front

What is the main sequence in the context of stellar classification?

Back

A continuous and distinctive band of stars that appears on plots of stellar color versus brightness.

Front

What is a supergiant star?

Back

A very large star that is even more massive than a giant star.

Front

What is the significance of a star's brightness in its classification?

Back

Brightness helps determine the star's stage in its life cycle and its classification.

Front

What is the difference between a red giant and a white dwarf?

Back

A red giant is a large, luminous star in a late stage of evolution, while a white dwarf is a small, dense remnant of a star that has exhausted its nuclear fuel.