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Transcript
Chapter 28
• Electromagnetic
Spectrum
• The range of
light from short
to long
wavelengths
• The Doppler
Effect
• Whether stars
are moving
toward or away
from Earth
• Redshift
• Star is slowly
moving away
from Earth
• Blueshift
• Movement of a
star toward
earth
Star Characteristics
• Constellations
• A group of stars
that seem to
form a pattern in
the night sky
Big Dipper
Little Dipper
• Circumpolar
constellations
• Revolve around
the North Pole
so that they can
be seen all year
long
• Magnitude
• Apparent
magnitude
• Absolute
Magnitude
• The brightness
of a star
• How bright a
star appears to
be
• How bright a
star really is
(also called
Luminosity)
Distance in space
• Astronomical
Unit
• 150 million
kilometers, the
average
distance
between the
earth and the
sun
• Light-year
• Measure of
distance in
space
• 9.5 trillion
kilometers
Color of Stars
• Cool stars
• Red
• Warm stars
• Bluish-white
• Galaxy
• A system
containing
millions to
billions of stars
• Milky Way
• spiral