Transcript Sun and Stars

Sun and Stars
By: Jill Davis and Elizabeth Gay
The Stars in our Universe
To start out with, there
are many stars in our
universe (approx. 100
billion), including the
closest star; the sun.
Throughout this Power
Point, you will learn
everything you need to
know about the stars in
our universe.
What is a star?
A star is a massive,
glowing ball of plasma,
which shines because of
nuclear fusion in its core.
This nuclear fusion
releases energy which
travels through the star's
different layers and then
radiates into outer space.
The closest star to Earth; the Sun
The Sun contains more than 99.8% of
the total mass of the Solar System. The
sun is also the largest star in the solar
system. We know this star as “The Sun”,
though in the past, the Greeks have called
it “Helios”, and the Romans have called it
“Sol”. Around 40.5 billion years old, the
sun continues to light the earth to this day.
Sun’s Facts
Diameter: 1,390,000 km.
Mass: 1.989e30 kg
Temperature: 5800 K (surface)
Temperature:15,600,000 K
(core)
Stars in our Universe
The 25 brightest stars are
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Sirius
Canopus
Arcturus
Rigel Kent
Vega
Capella
Rigel
Procyon
Ori
Achernar
Hadar
Altair
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Acrux
Aldebaran
Spica
Antares
Pollux
Fomalhaut
Deneb
Cru
Cen
Regulus
Adhara
Castor
Y Cru
This upcoming picture will give you a better look at these stars.
Constellations
• In the sky, stars form constellations, which
is a group of stars that forms a picture or
image. Some well-known constellations
include:, the big dipper, the little dipper,
Orion, Virgo, Leo, and Draco. The Greek
have created myths about each of these
constellations, and the role of them.
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The Big
and Little
Dipper
The Big and Little Dippers are very
well-known to humans. They are
part of other constellations in our
universe, and are easily found.
The Big Dipper makes up part of
the constellation of the ursa Major,
or the Big Bear. The Little Dipper
is part of the constellation Ursa
Minor, the Little Bear.
Orion
Orion, also
known as the The
Hunter, is one of
the most largest,
and well-known
constellations. In
Greek myths, Orion
is the “master of the
winter”, who has a
hunting dog named
Sirius.
Virgo
Virgo is the second-largest constellation in the
nighttime sky. The sun passes through the Virgo
constellation in mid-September, and is known as the
constellation that announces the harvest.
Leo
Leo is a compact
constellation,
which is readily
recognizable. In
mythology," Leo
the Lion” roamed
the hills and
streets of the
Peloponnesian
villages, eating
anyone who was
in his path.
Draco
In mythology, Draco the Dragon is a character that is
involved in the 11th task of Hercules, which was stealing the
golden apples of an apple tree. This constellation now holds less
stars than in the past, and has different phases depending on the
month. The Dragon’s head takes on a different look depending on
the time of the year.
As you can see, the sun and stars play a big
role in our universe, surrounding the earth
with light. Not only historical, but these
interesting objects are fun to learn, and
read about.
This PowerPoint was created
thanks to….
• www.nineplanets.org/sol.html
• http://dictionary.reference.com/browse/con
stellation
• http://www.op97.k12.il.us/lab/mm/astrono
my/constellations.html
• http://www.dibonsmith.com/stars.htm
• http://www.astropix.com/HTML/C_SPRING
/URSAS.HTM