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25 questions
What happens during nuclear fusion in the sun?
oxygen nuclei combine to form helium
Helium nuclei combine to form oxygen
helium nuclei combine to form hydrogen
hydrogen nuclei combine to form helium
a gigantic explosion that causes the death of a large star
pulsar
red giant
supernova
black hole
Why won't our sun ever become a black hole?
It is too massive
It is too old
It is too young
It is too small
A light-year is:
A measurement of time.
A measurement of distance.
What is a light year?
A length in time.
How far light travels in a year.
How long it takes light to die out.
How long until a light ray turns into a gamma ray.
When nebula is big and hot enough is collapses on itself and ...................... is made
white dwarf
supernova
protostar
planetary nebula
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