sour nebula began to collapse under its own gravity and spin faster a dense
own gravity and spin faster a dense
own gravity and spin faster a dense clump of matter formed in the center
clump of matter formed in the center
clump of matter formed in the center it’s called a protostar at first its
it’s called a protostar at first its
it’s called a protostar at first its heat was due to friction but when the
heat was due to friction but when the
heat was due to friction but when the clump reached 18 million degrees
clump reached 18 million degrees
clump reached 18 million degrees Fahrenheit
Fahrenheit
Fahrenheit nuclear fusion kicked in
four and a half billion years ago our
four and a half billion years ago our star was born
hydrogen atoms fuse together to form
hydrogen atoms fuse together to form helium and in the process release
helium and in the process release
helium and in the process release photons it’s the first light made by our
photons it’s the first light made by our
photons it’s the first light made by our Sun and it will keep on shining for four
Sun and it will keep on shining for four
Sun and it will keep on shining for four billion years a vast nuclear furnace
billion years a vast nuclear furnace
billion years a vast nuclear furnace nearly a million miles across from a
nearly a million miles across from a
nearly a million miles across from a distance this process seems almost
distance this process seems almost
distance this process seems almost peaceful with the sun’s power gently
peaceful with the sun’s power gently
peaceful with the sun’s power gently radiating out into the early solar
radiating out into the early solar
radiating out into the early solar system there was all sorts of activity
system there was all sorts of activity
system there was all sorts of activity going on things were changing rapidly
going on things were changing rapidly
going on things were changing rapidly violence explosions intense radiation we
violence explosions intense radiation we
violence explosions intense radiation we had a pretty spectacular origin I think
had a pretty spectacular origin I think
had a pretty spectacular origin I think recent research suggests the solar
recent research suggests the solar
recent research suggests the solar system’s birth was far from peaceful our
system’s birth was far from peaceful our
system’s birth was far from peaceful our Sun may in fact have been born out of
Sun may in fact have been born out of
Sun may in fact have been born out of one of the most violent events in the
one of the most violent events in the
one of the most violent events in the cosmos the explosive death of another
cosmos the explosive death of another
cosmos the explosive death of another star
and even before that it seems there was
and even before that it seems there was an explosion so huge that it created an
an explosion so huge that it created an
an explosion so huge that it created an entire universe the Big Bang no one
entire universe the Big Bang no one
entire universe the Big Bang no one knows what caused it but we think that
knows what caused it but we think that
knows what caused it but we think that the Bang created space-time and all the
the Bang created space-time and all the
the Bang created space-time and all the matter in the universe yet for
matter in the universe yet for
matter in the universe yet for astrophysicists such as professor Stan
astrophysicists such as professor Stan
astrophysicists such as professor Stan Woosley there’s a puzzle the Big Bang
Woosley there’s a puzzle the Big Bang
Woosley there’s a puzzle the Big Bang produced almost none of the 88 naturally
produced almost none of the 88 naturally
produced almost none of the 88 naturally occurring chemical elements when we look
occurring chemical elements when we look
occurring chemical elements when we look around we don’t just see hydrogen and
around we don’t just see hydrogen and
around we don’t just see hydrogen and helium
helium
helium we see planets and people and we’re made
we see planets and people and we’re made
we see planets and people and we’re made out of carbon and oxygen and planets are
out of carbon and oxygen and planets are
out of carbon and oxygen and planets are made out of iron and silicon and that
made out of iron and silicon and that
made out of iron and silicon and that didn’t all come from the Big Bang it had
didn’t all come from the Big Bang it had
didn’t all come from the Big Bang it had to come from somewhere else here on
to come from somewhere else here on
to come from somewhere else here on earth we have learned how to create new
earth we have learned how to create new
earth we have learned how to create new elements for ourselves nuclear
elements for ourselves nuclear
elements for ourselves nuclear technology the same thing happens inside
technology the same thing happens inside
technology the same thing happens inside stars hydrogen and helium from the Big
stars hydrogen and helium from the Big
stars hydrogen and helium from the Big Bang fuse to form heavier elements and
Bang fuse to form heavier elements and
Bang fuse to form heavier elements and if the star is big enough at the end of
if the star is big enough at the end of
if the star is big enough at the end of its life it does something spectacular
its life it does something spectacular
its life it does something spectacular it explodes the energy of a supernova
it explodes the energy of a supernova
it explodes the energy of a supernova explosion it is essentially equal to all
explosion it is essentially equal to all
explosion it is essentially equal to all of the energy that the Sun will put out
of the energy that the Sun will put out
of the energy that the Sun will put out in its ten billion year lifetime
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