Numbers

A star is formed from a swirling cloud of dust and gas called a nebula.  The forces of gravity press the matter in the nebula together.  When the matter is pressed tightly enough, it gets hotter and hotter, until a new star is born.  This new star is large and cool.  Cool is 3,000 degrees Celsius!  This new star has a red glow.

If the star continues to compress together, the matter may become one of several different colors.  A yellow colored star may form that is considered lukewarm.  A white star, which is warm, may also form.  Finally, if the matter is compressed very tightly, the hottest star is formed.  It is blue in color.  Our sun is a yellow star.

Hot

Warm

Lukewarm

Cool

blue

white

yellow

red

 

Directions:  Answer the questions about how a star is formed.

A is a swirling cloud of dust and gas.

A star has a temperature of 3,000 degrees Celsius.

What color star is our sun?

What color star is cooler than our sun?

Put the stars in order from cool to hot.  Use the numbers 1, 2, 3, 4.  1 being cool and 4 being hot.

blue

red

white

yellow

 

 

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Different Types of Stars