Today you will use a webquest to learn more about stars!

Click Stars: Lights in The Sky and write the answers to the following questions on your paper.

1) - Name the brightest star in the known universe.
2) - What is its magnitude? 
3) – Do the brightest stars have a high or low magnitude value? 
4) – What is the relationship between a star’s color and its temperature?
5) – Do stars in the sky actually twinkle? 
6) - Do a search on the internet for "brightest stars" and create a top 5 list on your paper of their names.

Two of the most important characteristics of stars are temperature and absolute magnitude.  About 100 years, Ejnar Hertzsprung in Denmark and Henry Norris Russell in the United States each made graphs to find out if temperature and brightness are related.  They plotted the temperatures of stars on the x-axis and their brightness on the y-axis.  The points formed a pattern.

The graph they made is still used by astronomers.  It is called the Hertzsprung-Russell diagram, or H-R diagram.  Click on the image of the Hertzsprung-Russell Diagram.  As you can see, most of the stars form a diagonal line called the ‘main sequence.’  More than 90% of all stars are main-sequence stars.  The sun is among the stars on the main sequence.

7) – As surface temperatures of the main sequence stars increase, what happens to their brightness?
8) – Which is hotter – a red star or a blue star?
9) – Choose a star that is not on the main sequence.  List its characteristics.

The Life Cycle of a Star
Click on the interactive activity that shows the life cycles of two different types of stars:  low mass stars (like our sun) and high mass stars. 

 10) – Fill out the comparison chart on your worksheet.

Black Holes
Click on the link to learn more about black holes.

11) – Are black holes ACTUALLY holes? 
12) – What exactly is a black hole?
13) – Fill in the blank:  The gravity of a black hole is so strong that not even _______ can escape!

Have some extra time?  Play “Black Hole Rescue”!  Be sure to read the directions and let your teacher know your high score!

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