Download Universe - Science

Diagram a comet
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http://media.nasaexplores.com/lessons/01-072/images/cometdiag.gif
Describe GALAXY
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A galaxy contains stars, gas, and dust which are
held together as a group by gravity. There may
be millions, or even billions, of stars in one
galaxy. There are billions of galaxies in the
universe.
How are galaxies
classified?
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Galaxies are classified according to their shape.
Some galaxies are called "spiral", because they
look like giant pinwheels in the sky. The galaxy we
live in, the Milky Way, is a spiral galaxy. Some
galaxies are called “elliptical", because they look
like flat balls. A galaxy may be called "irregular" if it
doesn't really have a shape. A new type of galaxy
was discovered recently, called a "starburst"
galaxy. In this type of galaxy, new stars just seem
to 'burst out' very quickly.
http://starchild.gsfc.nasa.gov/docs/StarChild/universe_level1/galaxies.html
Describe
STAR
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• A star is a brilliantly glowing sphere of hot gas
whose energy is produced by an internal
nuclear fusion process. Stars are contained in
galaxies.
http://starchild.gsfc.nasa.gov/docs/StarChild/universe_level2/stars.ht
ml
What is the HertzsprungRussell Diagram?
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• A tool that shows relationships and differences
between stars. It shows stars of different ages
and in different stages
Diagram the life
cycle of a star
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www.seasky.org/cosmic/sky7a01.html
Describe the
types of stars
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• Main Sequence Stars - maintains a stable
nuclear reaction.
• Red Giants - a large star that is reddish or
orange in color. It represents the late phase of
development in a star's life, when its supply
hydrogen has been exhausted and helium is
being fused
• White Dwarfs - the remnant of an averagesized star that has passed through the red
giant stage of its life. After the star has used up
its remaining fuel.