The Life Cycle of Stars

Do Now

Compare Aldebaran with Sirius B. Which star is hotter? Which is brighter? How do you know?

Agenda

Do Now Mrbrysonscience.wikispaces.com Life Cycle of Stars Simulation Exit Ticket

Stellar Variables

Heat Color Mass Life Cycle Size Luminosity/Magnitude/Brightness

Marbles and Washer in Balloons

Place washer in blue balloon Place black marbles in white balloons Place white marbles in red and

yellow balloons

When you start to blow, blow your balloon down towards the floor You don’t want to swallow the marble!

Masses of your stars

Red Star

Yellow Star

White Star

Blue Star

Mass of Star .4 Solar Mass(2/5 the mass ofour Sun)

1 Solar Mass (themass of ourSun)

8 Solar Masses (8times the mass ofour Sun)

16 Solar Masses(16 times themass of ourSun):

Galaxy 222

The balloons represent stars Every student has a star with a

different mass How is mass different from size?

Mass is the amount of matter in the object regardless of size.

Ex. computer and box

When your star has finished its cycle, follow along with the rest of Galaxy 222 and fill in the boxes on your worksheet.

In our Stellar Nursery

Red Star

Yellow Star

White Star

Blue Star

Blow up Balloon to about 3” diameter

Blow up Balloon to about 3” diameter

Blow up Balloon to about 3” diameter

Blow up Balloon to about 3” diameter

What’s happening right now in the nursery?

10 Million Years Old

Red Star

Yellow Star

White Star

Blue Star

Wait Wait Wait Blow slightly more air into the balloon.

This star is becoming a red giant.

11 Million Years Old

Red Star

Yellow Star

White Star

Blue Star

Wait Wait Wait Quickly blow up balloon until it is fully inflated. Pop balloon. Catch washer.

This star exploded in a supernova and became a black hole.

50 Million Years Old

Red Star

Yellow Star

White Star

Blue Star

Wait Wait Blow slightly more air into balloon.

This star is becoming a red giant.

Still a black hole.

55 Million Years Old

Red Star

Yellow Star

White Star

Blue Star

Wait Wait Quickly blow up balloon until fully inflated. Pop balloon. Catch marble.

This star exploded into a supernova and became a neutron star.

Still a black hole.

10 Billion Years Old

Red Star

Yellow Star

White Star

Blue Star

Wait Blow up a little bit.

This star is becoming a red giant.

Still neutron star.

Still a black hole.

12 Billion Years Old

Red Star

Yellow Star

White Star

Blue Star

Wait Blow up more.

This star is a red giant.

Still neutron star.

Still a black hole.

12.5 Billion Years Old

Red Star

Yellow Star

White Star

Blue Star

Wait Blow up a little more. Then cut up balloon into small pieces. Catch marble.

This star releasesits outer layers asa planetarynebula andbecomes awhite dwarf.

Still neutron star.

Still a black hole.

100 Billion Years Old

Red Star

Yellow Star

White Star

Blue Star

Deflate Balloon

This star becomes a white dwarf.

Still white dwarf.

Still neutron star.

Still a black hole.

Discussion

What was the effect of mass on life span?

Which stars deflated and which stars exploded?

What does this tell you about our sun?

Exit Ticket

Explain the effect of mass on a star’s life cycle?