1.1. Complete the table by numbering the stages 1 - 6 to show the correct order of the life cycle of a star.

1.2. A star can be in its main sequence phase for billions of years.

Figure 1 shows the forces acting on the Sun during this stable stage of its life cycle. 

Figure 1

Name the force pulling inwards.

Explain what causes the force pushing outwards.

1.3. Two stars, Alpha Centauri B and Betelgeuse are 0.9 and 16.5 solar masses respectively.

Which star could eventually become a neutron star? Explain your reasoning.  

1 solar mass = mass of the Sun

1.4. Define the term supernova.