Stellar Nursery: Large cold clouds of dust and gas where stars form.
Protostars: The stage in the formation of a star just before nuclear
Brown Dwarf: An object with a mass less than about 8% of the mass
of the Sun, but about 10 times greater than that of Jupiter.
Red Dwarf: A star with a mass between about 8% and 50% the mass
of the Sun.
Sun-Like STAR: A star with mass between about 50% and 10 times
that of the Sun.
Blue Supergiants: Stars much more massive than the Sun.
Red Giant: A phase in the evolution of a star after nuclear fusion
reactions that convert hydrogen to helium have consumed all the
hydrogen in the core of the star, and energy generated by hydrogen
fusion in the shell causes the star’s diameter to greatly expand and
Blue Giant: After a massive red giant star ejects its outer layers, its hot
inner core is exposed, and it becomes a blue giant star.
Planetary Nebula: A nebula produced after an exhausted giant star
puffs off its outer layer and leaves behind a smaller, hot star.
White Dwarf: The end phase of a Sun-like star in which all the material
contained in the star, minus the amount blown off in the red giant
phase, is packed into a volume one millionth the size of the original
Neutron Star: An extremely compact star produced by the
collapse of the core of a massive star in the supernova process.
Blackholes: If the core of a collapsing star has a mass that is
greater than three Suns, no known force can prevent it from
forming a black hole.
Type Ia Supernova: An explosion produced when a white dwarf
becomes unstable due to the accretion of too much material or
merger with another white dwarf.
Type II Supernova: A supernova that occurs when a massive star
has used up its nuclear fuel and its core collapses to form either a
neutron star or a black hole, triggering an explosion.
Pair-instability Supernova: A rare type of explosion predicted to
occur as a consequence of the extremely high temperatures in the
interiors of stars having masses of about 200 suns.
Supershells: The combined activity of many stellar winds and
supernovas create expanding supershells that can trigger the
collapse of clouds of dust and gas to form new generations of
End phases: A star’s ultimate fate depends on its mass. It can
fade into obscurity (brown dwarf or red dwarf), become a white
dwarf (sun-like stars), explode as a supernova and leave behind a
neutron star or a black hole (massive to very massive stars), or
be disrupted entirely (white dwarfs in close binary systems, or
extremely massive stars).