Transcript Lifecycle of the stars.


The nebula- first starts
out as only a cloud of
dust & gases
http://upload.wikimedia.org/wikipedia/com
mons/c/c2/Sig07-006.jpg
A proto star is just like a baby star
 Small proto star-a brown dwarf
that was too small to generate
enough heat to start fusion.


A main sequence star happens when
the protostar gains enough mass to
begin fussion. (all main sequence stars
fusse hydrogen.)
URL:notes
URL:notes
The first step starts when two
hydrogen nuclei smash each other
together at high speeds.
 Then the hydrogen nuclei stick
together to make a large nucleus.
 last, big amounts of energy
 (fusion is only caused in the sun
and in fission bombs aka H-bombs)


Helium fusion is almost like hydrogen
fusion except that it’s a lot stickier.
after the red giant has completely stopped
fussing the outer layers will be pulled away from it.
http://chandra.harvard.edu/photo/2000/pne/
The white dwarf is basically the left over
core of the star.
 a white star may only get to the size of
earth, but its mass equals to ½ of the
suns.

http://chandra.harvard.edu/photo/category/whitedwarf_pne.
html
A
white dwarf will cool off over
trillions of years until it will no
longer emit light(which then
turns into a black dwarf.)
 The
next step starts over at a
nebula and a protostar.
 The
massive main sequence
stars fuse hydrogen even
faster than a small or medium
stars.
URL:notes
 When
the massive main
sequence star runs out of
hydrogen, then it will start to
fuse helium, carbon
,oxygen….ect.
URL:notes
 The
fussion
in the red
giant stops
and starts
to create
a huge
explosion.
http://chandra.harvard.edu/photo/2006/n49/
 The
super dense core of
the star left over from the
supernova.
http://chandra.harvard.edu/photo/2002/113
2/
Stars with masses
of 25 to 50 times
the sun.
 From blackholes
from after a
supernova
 The leftover core
of the star is so
dense that it
causes a
gravitational pull.

http://chandra.harvard.edu/photo/category/blackho
les.html