P8-stars Flashcards
clouds of ____ and gas (hydrogen) called a ______ are pulled together by the _____ of _______. when the cloud is concentrated enough, a _______ is formed. As this gets smaller and ______, the ______ rises.
dust, nebula. speed of gravity. Protostar. denser, temperature
when it is ___ enough, ____ ____ begins and hydrogen nuclei fuse to form ____ nuclei. This gives out huge amounts of ______, keeping the ____ of the star HOT.
hot, nuclear fusion.helium.energy, core
star becomes a ____ ______ star. this is ____ because the force of _____ acting inwards and the force from the _____ acting outwards are balanced.
Main sequence ends when ______ runs out
main sequence. stable, gravity, nucleus. hydrogen
when main sequence ends, ____ continues and _____ atoms fuse instead, forming elements up to _____. the ____ of the star determines the next life- cycle stage.
fusion, helium, iron. size
if similar size to the sun/smaller:
star expands up into a ___ ____. heavier elements are created in the star’s ___ .when star is _____ gravity causes star to ______ in on itself.Heats up, goes from red> _____> white.it is a _____ _____.when this cools down, it no longer emits ____/light and forms a ____ _____.
red giant, core. unstable, collapse. yellow. white dwarf. heat. black dwarf
why does gravity cause the star to collapse in on itself?
because when there is no fusion occurring, there’s no outward force from the nucleus .forces are unbalanced
If the star is larger than the sun:
it is a _____ ____ giant. Star ____, cools and turns ___.eventually it ______ rapidly (a _________). during this, _____ makes elements heavier than ____.these are ______ throughout universe. core is ______ into very dense ______ ____ . if its massive enough, becomes ___ ___. so dense that no ____ escapes it.
red super. expands, red. collapses, supernova. fusion, iron. distributed. compressed neutron star. black hole, light
