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What is a star?
Do the stars always appear in different places in the sky
Is the Sun a star? How
Space - Stars
Bibliography?
How many stars each night?
Characteristics?
By Christine
What are stars made of?
How far away are the stars?
Are the stars always in the sk
What is a star?
A star is a ball of hot gas held together by
its own gravity. The stars force of gravity is
always causing the star to collapse. The
gravity is a balance of hot gas and radiation
coming from inside the star. This is called
hydrostatic support. A star gives off light by
nuclear burning in the stars core.
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What is a star made of?
Stars are made of two very hot gases, hydrogen and
helium. These are the two lightest elements. They
shine by burning the hydrogen into helium in their
cores, then later in life they create heavier elements.
Most stars have heavy elements, like carbon,
nitrogen, oxygen and iron but only small amounts.
These elements came from the stars that existed
before them. When a star runs out of fuel, it gives
much of its elements back into space. New stars are
made from this material, meaning that the material in
stars is recycled.
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Is the sun a star? How?
The sun is like any other star, it has an average
size and temperature, and shines as bright as
other stars do. Some stars are bigger and hotter
and some a smaller and cooler. Like our sun
there are billions of stars in our universe. We
need the sun because it is our source of heat,
light and energy, and without it we would not
exist. If there was a small problem with the
energy output of the sun, it could drastically
affect our lives. The sun has a diameter of 1.4
million km across and an average surface
temperature of 5800 Kelvin. At its equator, the
sun turns once every 25 days.
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Are the stars always in the sky?
– Day and night?
There are stars in the sky in the day and in the
night. We can only see the stars in the night
because they are shining so brightly in the night
sky. Stars do glow during the day but we cannot
see them because the light blue sky is so much
brighter than the faint glow coming from the stars.
If you were standing on the moon for example, you
would be able to see the stars both day and night.
This is because there is no atmosphere on the
moon, meaning that it is always dark. Therefore
you can see the stars.
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Do the stars always appear in different
places in the sky?
The stars move in two different ways. One is very
obvious. The Earth rotates on its axis, which would
make it look like the stars are moving once around
the Earth every 24 hours. So it isn't the stars that
are moving but the actual Earth itself. The other
way, the stars are really moving through space
relative to each other and Earth. But because the
stars are so far away, this movement would require a
telescope and precise measurements to be sure.
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Around how many stars are in the
sky each night?
The number of stars in the sky still remains a
mystery to this day, because there are just too many
to count. Stars are not spread out everywhere in
space but are grouped together in galaxies. Instead
of counting the stars individually, scientists look at
the size and brightness of each galaxy and estimate
the number of stars that make it up. The milky way
alone is made up of an estimate of 100,000,000,000
stars!! ( one hundred thousand million )! If someone
tried to count the stars of the milky way, at a rate of
one star per second, it would take over 3,170 years!!
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How far away are the stars?
The stars are not all spread out evenly in our
universe, meaning that they are not all the same
distance from us. Some are closer and some are
further away. If a star is glowing brightly it means
it one of the closer stars. If a star is quite dim, it is
much further away. Stars come in different
brightness's and sizes. Larger stars shine more
brightly than smaller stars do. The brightness of a
star helps scientists estimate the size and how far
away it is from us. The closest star is about
39,900,000,000,000 km away!!! ( thirty nine trillion,
900 billion ) but the furthest star is so much further
away.
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A stars
temperature is
determined by
its colour
Characteristics?
Shapes of stars
The international research led
by an Auckland astronomer has
found stars are not just round
twinkling dots in the night sky they can also be oval or shaped
of a cigar. Dr Ian Bond from
Massey University says
researchers have suspected for
some time that stars come in
various shapes and sizes, but
there wasn't any obvious data
as the stars are so far away.
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Bibliography/Picture Bibliography
Bibliography :
 http://imagine.gsfc.nasa.gov/docs/science/know_l2/stars.html
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Homepage

http://www.nmm.ac.uk/explore/astronomy-and-time/astronomyfacts/stars/what-is-a-star

http://coolcosmos.ipac.caltech.edu/cosmic_kids/AskKids/starcomp.s
html

http://starryskies.com/solar_system/sun/sun.html

http://answers.yahoo.com/question/index?qid=20080604222055AA
hM8Vc

http://www.astronomywa.net.au/index.php?option=com_content&vi
ew=article&id=312:how-many-stars-are-in-the-sky&catid=41:askan-astronomer&Itemid=12

http://coolcosmos.ipac.caltech.edu/cosmic_kids/AskKids/stardist.sht
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