93 Exploring the Seasons - Prentice Hall · 94 Exploring Phases of the Moon New ... white dwarfs....
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Noon sun vertical at equator N September Equinox December Solstice June Solstice March Equinox December Solstice March Equinox Noon sun vertical at 23.5° S Noon sun vertical at 23.5° N N N S S S Equator Equator June Solstice SCIENCE EXPLORER Focus on Physical Science © Prentice-Hall, Inc. Sun’s rays Sun’s rays Sun’s rays 93 Exploring the Seasons E q u a t o r
Transcript of 93 Exploring the Seasons - Prentice Hall · 94 Exploring Phases of the Moon New ... white dwarfs....
Noon sunvertical atequator
N
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DecemberSolstice
JuneSolstice
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23.5° S
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93 Exploring the Seasons
Equator
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94 Exploring Phases of the Moon
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99 Exploring the SunSC
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105 Exploring the Lives of Stars
A star’s life beginswhen gas and dustin a nebula contractto form a protostar.
When a star begins to run outof fuel, it expands to becomea giant or supergiant.
Small andmedium stars
become redgiants and thenwhite dwarfs.
When a whitedwarf runs out ofenergy, it turnsinto a black dwarf.
Giant andsupergiant stars
can blow up intosupernovas.
The remains of thesupernova becomea neutron star.
The remains of the mostmassive stars collapse intoblack holes. Not even lightcan escape from a black hole.
Nebula
Protostar
Red Giant or Supergiant
White Dwarf
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106 The Milky Way GalaxySC
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Form
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A c
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as a
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a s
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Gas
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Th
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clu
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sun
, p
lan
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, an
d b
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so
f ro
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ice,
and
du
st.
