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To do today:
· 4.26 Describe the evolutionary cycle of a star
with solar mass and of stars with greater mass.
· 4.27 Describe and identify the main components
of the Hertzsprung-Russell diagram.
· 4.28 Describe the observational evidence for
black holes, including accretion discs or orbiting
· binary companions.
· 4.35 Show some understanding of the physical
characteristics of different types of nebula and
· star cluster.
· 4.39 Describe quasars.…read more

Slide 3

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Nebula: Gas
"Baby" star
and dust cloud Main Sequence:
Our sun is at this Red Giant (3 suns
stage or less)
Supernova: The
star explodes
Red Giant (Bigger
than 3 Suns)
White Dwarf: Very
small and very hot
Black Hole: so
Neutron star: very Black Dwarf:
much gravity not
small and very very Cooler and darker
even light can
HRD…read more

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Main sequence star
· Our sun is at this
· This is the most
stable stage for a star
· Our sun has been a
main sequence star
for 5 billion years
now, and will remain
so for another 5 billion
years.…read more

Slide 5

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Horsehead Nebula
· This nebula is
over 1000 light
years away in the
constellation of
· It is visible from
Earth only
because it blocks
the light coming
from the stars
behind it
· It is a very dark
nebula…read more

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Eagle Nebula
· Cloud formed
of gas and
· It is here that
stars are
"born" Neb
· These can be
seen in this
· neb…read more

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