Key Questions and Terms Notes

The brightness of a star as measured from Earth is called its .

What is a star's absolute brightness?

What does the color of a star reveal about the star?

How does the size of a star influence its brightness?

What is a Hertzsprung-Russell (HR) diagram?

How are stars categorized using an HR diagram?

What are some properties of the four categories of stars?

Supergiants:

Giants:

Main sequence:

Dwarfs:

What is the approximate absolute brightness and temperature of the dwarf star labeled A?

What is the approximate absolute brightness and temperature of the main sequence star labeled B?

What is the approximate absolute brightness and temperature of the giant star labeled C?

What type of star has an absolute brightness of 5 and a surface temperature less than 2,500 °C?

The Origin and Classification of Stars Video

Key Questions and Terms

Notes

What determines the fate of a star?

What is a nebula?

How are proto-stars formed?

What happens within a proto-star to create a star?

Usually, the stars are the hottest stars.

What color are the brightest stars?

Our sun is a -sized star with a temperature around 6,000 degrees Celsius.