ASTRONOMY

101

Stars

HOW MANY STARS CAN WE SEE IN THE SKY?

Around 3000 in each hemisphere

but…..

HOW MANY STARS CAN WE SEE IN THE SKY?

All are in our galaxy, the Milky Way.

HOW MANY STARS CAN WE SEE IN THE SKY?

And the Milky Way contains 200-400 Billion stars

ARE ALL STARS THE SAME?

No, they have different…

ARE ALL STARS THE SAME?

….Colors due to different Temperatures

ARE ALL STARS THE SAME?

Different Sizes Different Energy Processes

Different Chemical Composition

WHAT ARE STARS MADE OF?

http://www.youtube.com/watch?v=u-KyciKHw-g

WHY ARE SOME STARS BRIGHTER?

Some stars are closer…

WHY ARE SOME STARS BRIGHTER?

…and some stars are bigger.

WHY ARE SOME STARS BRIGHTER?

Apparent Magnitude= Brightness from Earth

Absolute Magnitude= Brightness from a distance of 10 Parsecs

HOW DO WE MEASURE BRIGHTNESS?

ARE CONSTELLATION STARS REALLY TOGETHER?

WHAT ARE DOUBLE STARS?

WHAT ARE VARIABLE STARS?

WHAT ARE VARIABLE STARS?

WHAT ARE VARIABLE STARS?

ARE STARS BURNING?

Demo Chemical Reaction of Magnesium

ARE STARS BURNING?

ARE STARS BURNING?

WHAT ARE STAR CLUSTERS

Open Clusters

WHAT ARE STAR CLUSTERS

Globular Clusters

WHAT ARE THE LIFE STAGES OF A STAR?

ASTRONOMY

101

In January‘Nebula’