• Prior learning– Our sun is a star

• Key words– Sun, Star, black dwarf, white dwarf, red giant, supernova, nebulae,

dust, hydrogen, helium

Unit 11 – Science and HumanitySept

Title: Find out the stages involved in the life cycle of a star

Describe long-term changes that have occurred in our universe to our solar system and earth

• Know the gaseous components of the sun (C)

• Describe the life cycle of a star in simple terms.(C)

• Explain in detail the life cycle of a star(C/B)

• I have stated that the sun is made from hydrogen gas

• I have described in simple terms the stages involved in a stars life

• I have explained in more detail the stages involved in a stars life and stated possible outcomes.

By the end of this lesson we should be able to:

Success Criteria:

Unit 11 – Science and Humanity

Starter

Unit 11 – Science and Humanity

• Can you name any patterns of stars (constellations)??

Unit 11 – Science and Humanity

The end of the life cycle of really massive stars is different to that of massive stars.

After a really massive red giant collapses in a supernova explosion, it leaves a star so dense that not even light can escape its gravitational pull. This is called a black hole!

Some scientists believe that there are black holes at the centre of galaxies.

If light cannot escape a black hole, then how can a black hole be observed?

Unit 11 – Science and Humanity

Use these words below to complete the life cycles of different stars:

nebulasmall nebula

large nebula

white dwarf

star like our Sun

red giant

neutron star

massive red giant

star larger than our Sun

supernova

Unit 11 – Science and Humanity

Comparing the life cycles of stars nebulasmall

nebulalarge

nebula

white dwarf

star like our Sun

red giant

neutron star

massive red giant

star larger than our Sun

supernova

Unit 11 – Science and Humanity

Unit 11 – Science and Humanity

This causes the ‘nebula’ to collapse.

Gravity causes a dust and gas cloud to condense into a smaller volume.

As the nebula collapses, temperatures and pressures inside the nebula increase.

When the temperature and pressure are great enough

nuclear fusion starts.

Eventually gravity and the outward pressure of escaping energy is

balanced. At this stage, it is called a star.

Plenary: What is the correct order for these sentences about how a star is formed?

Birth of a star

Unit 11 – Science and Humanity

Describe long-term changes that have occurred in our universe to our solar system and earth

• Know the gaseous components of the sun (C)

• Describe the life cycle of a star in simple terms.(C)

• Explain in detail the life cycle of a star(C/B)

• I have stated that the sun is made from hydrogen gas

• I have described in simple terms the stages involved in a stars life

• I have explained in more detail the stages involved in a stars life and stated possible outcomes.

By the end of this lesson we should be able to:

Success Criteria:

Unit 11 – Science and Humanity