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BELLRINGER The reproductive success of an organism depends in part on the ability of
the organism to survive. How does the physical appearance of these
organisms help them survive?
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0% 1. Their physical appearance helps them find a habitat.
2. Their physical appearance helps them resist parasites.
3. Their physical appearance helps them avoid predators.
4. Their physical appearance helps them defend a territory.
Astronomy
Chapter 26.1
The Sun
I. The Sun
A. Corona
1. Outer atmosphere
2. Invisible
B. Chromosphere
C. Photosphere
1. Visible
D. Convective Zone
1. Hot gases rise
2. Cool gas sinks
E. Radiative Zone
F. Core
1. Energy production
2. 15,000,000 ºC (27,000,000 ºF)
Page 43 – figure 9
rad
iativ
e zo
ne.
conve
ctiv
e zo
ne.
coro
na.
core
.
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The sun's energy is produced in
the
1. radiative zone.
2. convective zone.
3. corona.
4. core.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29 30
chro
mosp
here
photo
spher
e
coro
na
conve
ctiv
e zo
ne
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The ____ is a region of the sun where
hot and cooler gases circulate in
convection currents.
1. chromosphere
2. photosphere
3. corona
4. convective zone
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29 30
chro
mosp
here
coro
na
rad
iativ
e zo
ne
conve
ctiv
e zo
ne
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The ____ is a thin, red region of the sun just
below the corona which is too faint to see
unless there is a total solar eclipse.
1. chromosphere
2. corona
3. radiative zone
4. convective zone
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29 30
II. Energy Production A. Nuclear fusion
1. E = mc2
a. E = energy
b. m = mass
c. c = speed of light
2. Two or more nuclei join
a. Releases energy
III. Fusion in the Sun
A. Two hydrogen = deuterium
B. Hydrogen + deuterium = helium-3
C. Two helium-3 = helium-4 + energy
+ 2 hydrogen
Page 46 – figure 12
fusion310
nucl
ei
neu
trons
nucl
ei a
nd neu
trons
pro
tons
and e
lect
rons
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The number of ____ are what
give an atom its chemical
identity. 1. nuclei
2. neutrons
3. nuclei and neutrons
4. protons and
electrons
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
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hyd
rogen
deu
terium
hel
ium
-3
hel
ium
-2
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Fusion of hydrogen in the sun results
in two ____ atoms combining to
form ordinary helium-4.
1. hydrogen
2. deuterium
3. helium-3
4. helium-2
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21 22 23 24 25 26 27 28 29 30
IV. Sun’s surface
A. Sunspots
1. Dark spots
2. Cool areas
B. Solar flares
1. Storms
2. Cause auroras
Mauna Loa
Observatory
features214
chro
mosp
here
photo
spher
e
coro
na
conve
ctiv
e zo
ne
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The ____ forms the sun's outer
atmosphere where the gases are so thin
that this layer is visible only during a
total solar eclipse.
1. chromosphere
2. photosphere
3. corona
4. convective zone
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29 30
coro
na
photo
spher
e
rad
iativ
e zo
ne
conve
ctiv
e zo
ne
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The ____ is where the gases get thick
enough to see and is what we know as
the visible surface of the sun.
1. corona
2. photosphere
3. radiative zone
4. convective zone
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4.6
8.3
12.6
16.5
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The speed of light is about 3108 m/s and
the sun is about 1.51011 m from Earth.
When energy leaves the sun as light, it
takes ____ minutes to reach the Earth.
1. 4.6
2. 8.3
3. 12.6
4. 16.5
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