15 terms


Pre-natal stage of star
a dense region of cosmic matter forms due to gravity
Star is born (often in clusters)
gravity & temp. go increase, nuclear fusion creates other elements
Star stabilizes
Outward fusion force= inward gravity force, Sun and 90% of life,
Mass of Star
Star's life depends on it.
Larger mass, burn fast, short life
Smaller mass, burn slow, long life (Sun)
gravity takes over fusion, star swells to red giant, new energy found, lives, but not the same
Old Aged star -
2 types: Low mass: layers shed, NEBULAE & High mass: iron core, STAR COLLAPSES
Low mass: collapse to solid, very dense High mass:gravity makes it a black hole or neutron star (raindrop), rest of star blows up into a supernova
white dwarf fades away to black dwarf, supernova id more dense so becomes a neutron star, black hole is extremely dense
Universe began with these elements
Hydrogen and Helium
Creates other elements after Hydrogen and helium
We are all made of stardust?
As stars are born and die, their elements are spread through the galexy making stars and planets and all matter, including us (God does it!)
Object moving away from Earth
Spectral lines becoming longer wavelength, red
Object moving toward Earth
Spectral lines go to shorter wavelengths, blue