Life cycle of a star

Stars are born from a (a)   .

What is a nebula?

• a giant ball of plasma

• a giant cloud of dust and gas in space

• a titan-sized star

• a black hole-sized star

How many years do protostars last?

• 500,000 years

• 100,000 years

• 50,000 years

• 10,000 years

Which types do brown dwarfs occupy?

• O,B

• A,F,G

• K,M

• M,L,T,Y

What is the temperature of a red giant?

• 5,000 K

• 5,776 K

• 7,000 K

• 10,000 K

What are the largest known stars?

• Red giants

• Red supergiant

• Quasi stars

• neutron stars

All planetary nebulae form at the end of the life of a star of (a)   .

A supernova is (a)   .

Black dwarfs expected to exist in the universe at the present time?

• True

• False

What is the mass of neutron star?

• 100 and 250 solar masses

• 40 and 75 solar masses

• 20 and 50 solar masses

• 10 and 25 solar masses