Nuclear Fusion in Stars

What types of fusion reactions take place in the stars like the Sun?

How are different main sequence stars shown in the Hertzsprung-Russell diagram?

How do the stars with different masses evolve in their lifetimes?

A star is stable when the ______________ balances the ________________________ .

• inward pull of gravity

• outward push of radiation pressure

Which of the main sequence stars has shorter lifetime?

• Smaller mass

• Larger mass

Parsec(pc)：？

Stellar radius=?

What is the primary fuel for nuclear fusion in main sequence stars?

• Helium

• Hydrogen

Which type of star is formed from the remnants of a supernova explosion?

• Red giant

• Neutron star

What determines the color of a star?

• Its size

• Its temperature