Astronomy

How do main sequence stars like the sun make their energy?

• fusion of hydrogen into helium

• fission of hydrogen into helium

• fusion of helium into hydrogen

• fission of helium into hydrogen

Stars are born in

• the big bang

• black holes

• protoplanetary disks

• nebulae

A nebula is...

• cosmic microwave background

• planets that are in the process of forming

• a cloud of dust and gas in space

• the same thing as a singularity

Heavier elements like carbon, oxygen, silicon and iron were formed....

• inside giant and supergiant stars

• during the big bang

• inside main sequence stars

• on Earth

A star's luminosity is a measure of how ___________ the star is

• big

• bright

• hot

• massive

Compared to a yellow star, a blue star is always ________

• hotter

• colder

• bigger

• smaller

In general, as the radius (size) of a star increases....

• the temperature increases

• the temperature decreases

• the luminosity increases

• the luminosity decreases

After a medium to small star like our Sun has used up all of it's hydrogen, it will become a......

• white dwarf

• red giant

• interstellar cloud

• supernova

True or False: All stars will eventually become a black hole

• True

• False

After a Supergiant star has consumed its fuel and exploded in a supernova, it will become a ...

• black hole

• white dwarf

• neutron star

• supergiant