1. LIVES OF STARS CH 15 SEC 3

2. GOAL/PURPOSE  STUDENTS KNOW THAT THE SUN IS ONE OF MANY STARS IN THE MILKY WAY GALAXY AND THAT STARS MAY DIFFER IN SIZE, TEMP, AND COLOR

3. LIVES OF STARS KEY- STARS DO NOT LAS FOREVER KEY- ALL STARS BEGIN THEIR LIVES AS PARTS OF NEBULAS

4. NEBULAS NEBULAS-ARE LARGE CLOUDS OF GAS AND DUST SPREAD OUT IN AN IMMENSE VOLUME KEY- GRAVITY PULLS THE GAS TOGETHER PROTOSTAR- IS THE EARLY STAGE OF STARS LIFE BEFORE NUCLEAR FUSION KEY- A STAR IS BORN WHEN THE CONTRACTING GAS AND DUST BECOME SO DENSE AND HOT THAT NUCLEAR FUSION STARTS

5. LIFETIME OF STARS  KEY- HOW LONG A STAR LIVES DEPENDS ON ITS MASS  KEY- SMALLER STARS LAST LONGER THEN LARGER ONES BECAUSE THEY BURN FUEL MORE SLOWLY  KEY-OUR SUN IS A MEDIUM MASSED STAR EXPECTED TO LAST 10 BILLION YEARS AND IS ABOUT 4.6 BILLION YEARS OLD PlanetMassPeriod of rotation Distance from the sun Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune

6. COPY AND LABEL FIGURE 13 P. 610-611 USE THE TEXT TO DEFINE THE FOLLOWING STAGES OF THE LIVES OF STARS- PLANETARY NEBULA WHITE DWARFS SUPERNOVAS NEUTRON STAR PULSAR BLACK HOLES

7. CHECK FOR UNDERSTANDING- WRITE AND ANSWER THE FOLLOWING Q’S  WHAT DETERMINES WHICH STAGE OCCURS AFTER A SUPERNOVA?  HOW DO ALL STARS BEGIN?  WHAT IS THE RELATIONSHIP BETWEEN MASS AND END STAGES OF STARS?  HOW DO THEY THINK OUR SUN BEGAN?  DESCRIBE WHAT WILL HAPPEN TO OUR SUN TOWARDS THE END.