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Cards (10)
The brightness of a star as seen from the Earth depends on
two
factors -
distance
and the
actual brightness
(or
absolute brightness
) of the star
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Apparent brightness
The star's brightness as seen from
Earth
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Comparison of stars
Sirius is about
27
times as powerful as the
Sun
Rigel has
the power of many thousands of suns
Rigel
is almost
100
times farther away than
Sirius
Sirius is about
twice
as
bright
as Rigel
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Sirius
looks very bright when viewed from
Earth
because it is
closer
to
Earth
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Astronomers consider the star's
absolute
brightness when
comparing
stars
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Absolute brightness
The
brightness
the
star
would have if all stars were the same
standard distance
from
Earth
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The
Polaris
is commonly known as the
North Star
, the brightest star in the
Dipper
, very close to the
north celestial pole
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Polaris stands almost
motionless
in the sky and appears to
rotate
around the
north celestial pole
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Figure
7
shows the
orientation
of the
globe
and the
movement
around the
lamp
(
Sun
)
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The
Polaris
is used in
navigation
because it does not change its
position
in the
night sky
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