Download Unit 7 Beyond Our Planet

6th Grade Science
Spring 2006, PflugervilleISD
© Spring 2006, Pflugerville ISD, 6th Grade
Unit 7
Beyond Our Planet
Chapter 20: Our Solar System
Section 1: A Solar Family
Section 2: The Nine Planets
Section 3: Moons and Other Bodies
Chapter 21: Exploring Space
Section 1: Rocket Science
Section 4: Living and Working in Space
Spring 2006, PflugervilleISD
A Solar Family
Chapter 20 Section 1
Spring 2006, PflugervilleISD
A Solar Family
What Do You Think?
How does the sun differ from planets?
Chapter 20 Section 1
Spring 2006, PflugervilleISD
A Solar Family
An astronomical unit is the average
distance between the sun and Earth.
Chapter 20 Section 1
Spring 2006, PflugervilleISD
A Solar Family
Rotation is the spin of an object
in space.
Revolution is the motion of a
body as it travels around another
body in space.
Chapter 20 Section 1
Spring 2006, PflugervilleISD
A Solar Family
Cite: http://www.devastate.com/gif_list/gif_ani/e/earthrot.gif
Cite: http://www.mcwdn.org/MAPS&GLOBES/Revolution.GIF
Rotation/Revolution
Chapter 20 Section 1
Spring 2006, PflugervilleISD
A Solar Family
Cite:http://www.cs.duke.edu/courses/cps124/fall02/projects/solar/ss.jpg
The earth travels
around the sun
in a path called
an orbit.
Chapter 20 Section 1
Spring 2006, PflugervilleISD
A Solar Family
The corona forms the
outer atmosphere.
The chromosphere is
the thin region below the
corona.
The photosphere is
what we know as the
visible surface of the sun.
Chapter 20 Section 1
Spring 2006, PflugervilleISD
A Solar Family
The convective zone
is where gas
circulates.
The radiative zone is
a dense region where
atoms are packed
tightly.
The core is where
energy is produced.
http://observe.arc.nasa.gov/nasa/exhibits/sun/graphics/sun8.jpg
Chapter 20 Section 1
Spring 2006, PflugervilleISD
A Solar Family
There are many ideas about the source of
the sun’s energy. One idea is people
thought the sun was burning fuel to
generate its energy.
Citehttp://svs.gsfc.nasa.gov/stories/SORCE_20040219/images/elmagt.jpg:
Chapter 20 Section 1
Spring 2006, PflugervilleISD
A Solar Family
Another idea about the
sun’s source of energy is
the sun was thought to
have been shrinking
because of the release of
energy from the sun’s
gravitational force (If
this were true, it would
only burn for 45
million years).
Chapter 20 Section 1
Spring 2006, PflugervilleISD
A Solar Family
The sun gets it’s energy from nuclear
fusion. This is a process by which 2 or
more low mass nuclei join together or
fuse to form a massive nucleus.
Chapter 20 Section 1
Spring 2006, PflugervilleISD
A Solar Family
Solar activity is when thermal energy
moves from the sun’s interior by the
circulation of gases in the convection
zone causing gas in the photosphere to
boil and churn.
Chapter 20 Section 1
Spring 2006, PflugervilleISD
Cite :http://www.noaanews.noaa.gov/stories/images/solaranim092501b.gif
:
A Solar Family
Sun spots are formed when magnetic
fields slow down in the convective zone
causing areas on the sun to become
cooler.
Chapter 20 Section 1
Spring 2006, PflugervilleISD
Cite: http://www.celestialimage.com/steve%20lee%20sun.jpg
A Solar Family
Solar Sun Spots in action.
Chapter 20 Section 1
Spring 2006, PflugervilleISD
A Solar Family
Solar flares are giant storms on the sun’s
surface that send huge streams of electrically
charged particles into the solar system.
Solar flares cause light shows in the sky called
auroras.
Chapter 20 Section 1
Spring 2006, PflugervilleISD
Click to see a picture of
auroras.
A Solar Family
Cite: http://www.spacescience.com/headlines/images/perseids2000a/hershman1.jpg
Chapter 20 Section 1
Spring 2006, PflugervilleISD
Pre-AP Extension
Color affects the absorption of radiant
energy. Radiant energy is energy
due to radiation. Any object that has
a temperature is emitting radiant
energy. You can use the results of the
following lab to better dress for the
seasons.
Chapter 20 Section 1
Spring 2006, PflugervilleISD
See speaker notes for lab.
Let’s Review
1. What is the difference between
revolution and orbit?
Chapter 20 Section 1
Spring 2006, PflugervilleISD
A Solar Family
Revolution is the motion of one
body around another, while an
orbit is the path of an object as
the object revolves around
another object.
Chapter 20 Section 1
Spring 2006, PflugervilleISD
Let’s Review
2. Identify the characteristics of the
sun.
Chapter 20 Section 1
Spring 2006, PflugervilleISD
A Solar Family
Answer vary: The sun is a star that
gets it energy from nuclear fusion.
It is the center of the solar
system.
Chapter 20 Section 1
Spring 2006, PflugervilleISD
The Nine Planets
Chapter 20 Section 2
Spring 2006, PflugervilleISD
The Nine Planets
What Do You Think?
Name the nine planets.
Chapter 20 Section 2
Spring 2006, PflugervilleISD
The Nine Planets
In 1610, Galileo
Galilei realized that
planets are not just
points of light – they
are spherical bodies
like the Earth.
Cite: http://www.star.ucl.ac.uk/~idh/apod/image/0110/galileo_sustermans.jpg
Chapter 20 Section 2
Spring 2006, PflugervilleISD
The Nine Planets
The solar
system is
divided into two
main parts:
Inner planets
and the outer
planets.
Cite: http://www.astro.uiuc.edu/projects/data/KeplersLaws/images/planets.jpg:
Chapter 20 Section 2
Spring 2006, PflugervilleISD
The Nine Planets
The inner planets are
called terrestrial
planets because they
are small, dense, and
rocky like the Earth .
The inner planets are
Mercury, Venus, Earth,
and Mars.
Cite: http://www.manatee.k12.fl.us/sites/elementary/palmasola/inner2.jpg
Chapter 20 Section 2
Spring 2006, PflugervilleISD
The Nine Planets
The outer planets,
except Pluto, are
much larger and are
made mostly of
gasses thus are
called Gas Giants.
The gas giants are
Jupiter, Saturn,
Uranus, and
Neptune.
Cite: http://www.motivate.maths.org/conferences/conf42/Talk_images/outer_planets_small_2.jpg
Chapter 20 Section 2
Spring 2006, PflugervilleISD
The Nine Planets
Some planets rotate clockwise
(retrograde rotation) while others
rotate counterclockwise (prograde
rotation).
The planets that have a retrograde
rotation are Venus, Uranus, and Pluto.
Chapter 20 Section 2
Spring 2006, PflugervilleISD
The Nine Planets
Can you think of a way to
remember the order of the
planets? (mnemonic)
Chapter 20 Section 2
Spring 2006, PflugervilleISD
The Nine Planets
My very educated mother just
served us nine pizzas.
Chapter 20 Section 2
Spring 2006, PflugervilleISD
The Nine Planets
Mercury is the closest planet
to the sun.
A day = 59 Earth days
(because of slow rotation)
A year = 88 Earth days
Mercury has the biggest range in surface
temperatures.
Chapter 20 Section 2
Spring 2006, PflugervilleISD
The Nine Planets
Venus is more like Earth
than any other planet.
One way it differs,
however, is that Venus
has a retrograde
rotation.
Chapter 20 Section 2
Spring 2006, PflugervilleISD
The Nine Planets
The only planet that is known to
support life is Earth.
Earth is warm enough to keep water
from freezing and cool enough to
keep it from boiling.
Liquid water is a vital resource for life
on Earth.
Chapter 20 Section 2
Spring 2006, PflugervilleISD
Chapter 20 Section 2
Spring 2006, PflugervilleISD
Cite: http://www.lunaroutpost.com/gallery/earth/images/earth_full_hires%20copy.jpg
The Nine Planets
Mars, the red
planet, is the
fourth planet
from the sun.
There is strong
evidence that
water once
existed here.
Chapter 20 Section 2
Spring 2006, PflugervilleISD
The Nine Planets
Mars has the
largest mountain in
the solar system.
The name of the
mountain is
Olympus Mons and
it is an extinct shield
volcano.
Chapter 20 Section 2
Citehttp://nssdc.gsfc.nasa.gov/image/planetary/mars/olympus_mons.jpg
Spring 2006, PflugervilleISD
:
Mar's surface
Picture taken by the Viking lander
Chapter 20 Section 2
Spring 2006, PflugervilleISD
Cite: http://nssdc.gsfc.nasa.gov/image/planetary/mars/vikinglander2-2.jpg
The Nine Planets
Jupiter is the
largest gas giant.
Jupiter radiates
much more
energy into
space than it
receives from the
sun.
Chapter 20 Section 2
Spring 2006, PflugervilleISD
The Nine Planets
Saturn is the second
largest planet.
Saturn is made
mostly of hydrogen
and helium.
Saturn has the largest
rings, which are made
of icy particles.
Chapter 20 Section 2
Spring 2006, PflugervilleISD
The Nine Planets
Uranus is a small
giant. It may have
been tipped over
on its side when it
was hit by a
massive object.
It has a blue-green
color due to
methane.
Chapter 20 Section 2
Spring 2006, PflugervilleISD
The Nine Planets
Neptune has
a great dark
spot. It’s
atmosphere
contains belts
of visible
clouds.
Chapter 20 Section 2
Spring 2006, PflugervilleISD
The Nine Planets
Pluto is the farthest
planet from the sun.
It is covered by frozen
nitrogen and
it’s moon is more than
half its size.
Chapter 20 Section 2
Spring 2006, PflugervilleISD
Cite: http://www.xtec.es/centres/b7001413/imatges/pluto.jpg
The Nine Planets
Determine your weight on each planet.
Remember your weight is determined by
the planet’s gravitational pull.
What is my weight on another planet?
Chapter 20 Section 2
Spring 2006, PflugervilleISD
The Nine Planets
Activity
Select a planet of your choice and
create a power point about your
planet.
Chapter 20 Section 2
Spring 2006, PflugervilleISD
Pre-AP Extension
Examine the planetary distance
of each planet from the sun and
create a scale model of each
planet’s distance from the sun.
Chapter 20 Section 2
Spring 2006, PflugervilleISD
See speaker notes for lab.
Let’s Review
1. How are the gas giants different
from the terrestrial planets?
Chapter 20 Section 2
Spring 2006, PflugervilleISD
The Nine Planets
Gas Giants are much larger and
more massive, they occupy the
outer solar system, and they are
much more widely spaced than
the terrestrial planets.
Chapter 20 Section 2
Spring 2006, PflugervilleISD
Let’s Review
2. Explain what is so unusual
about Uranus’s axis of rotation.
Chapter 20 Section 2
Spring 2006, PflugervilleISD
The Nine Planets
Uranus’s axis of rotation is tilted so
that each pole points toward the
sun for part of Uranus’s year.
Chapter 20 Section 2
Spring 2006, PflugervilleISD
Let’s Review
3. What conclusion can you draw
about a planet’s properties just by
knowing how far it is from the
sun?
Chapter 20 Section 2
Spring 2006, PflugervilleISD
The Nine Planets
Planets farther from the sun tend to
have lower surface temperatures;
they are space farther apart; their
period of revolution is much
longer; they are most likely larger
and have more moons.
Chapter 20 Section 2
Spring 2006, PflugervilleISD
Moons and Other Bodies
Chapter 20 Section 3
Spring 2006, PflugervilleISD
Moons and Other Bodies
What Do You Think?
What are some other objects out in
space besides planets?
Chapter 20 Section 3
Spring 2006, PflugervilleISD
Moons and Other Bodies
Our moon’s name
is Luna. It is about
4.6 billion years old
and has numerous
impact craters.
The dark areas or
lava plains on the
moon are called
marias.
Cite:http://www.astrosurf.com/cidadao/moon_99_03_01.jpg
Chapter 20 Section 3
Spring 2006, PflugervilleISD
Moons and Other Bodies
Satellites are natural or artificial
bodies that revolve around a larger
body.
Moons are natural bodies that
revolve around a larger body.
Chapter 20 Section 3
Spring 2006, PflugervilleISD
Moons and Other Bodies
Asteroids are
small, rocky bodies
that revolve around
the sun = stony or
metallic
Many are found in
the asteroid belt
between Mars and
Jupiter.
Cite: http://www.astronomynotes.com/solarsys/asteroids-label.jpg
Chapter 20 Section 3
Spring 2006, PflugervilleISD
Moons and Other Bodies
Ceres is the
largest known
asteroid.
Cites: http://www.maiaw.com/dimetra/Dabout/Ceres.jpg
Chapter 20 Section 3
Spring 2006, PflugervilleISD
Moons and Other Bodies
Meteoroids are
like asteroids but
smaller.
Meteorites are
meteoroids that hit
the ground.
Meteors are the
bright streaks of
light in the sky.
Chapter 20 Section 3
Cite: http://www.lvaas.org/gallery/2001/bus-trip/willamette-meteorite.jpg
Spring 2006, PflugervilleISD
Moons and Other Bodies
Stony made of rock material.
Metallic made of iron and nickel.
Stony-iron made of rocky material
iron and nickel.
Open you textbook to page 561 to look
some pictures of these types of meteorites.
Chapter 20 Section 3
Spring 2006, PflugervilleISD
Moons and Other Bodies
Comets are small
body of ice, rock
and cosmic dust.
They are also
known as “snowy
dirtball”.
Cite:http://www.mpe.mpg.de/Pictures/x-comets.jpg
Chapter 20 Section 3
Spring 2006, PflugervilleISD
Moons and Other Bodies
– Nucleus is the solid center.
– Ion tail is made of electrically charged
particles.
– Dust tail is dust debris due to the sun’s
radiation.
Chapter 20 Section 3
Spring 2006, PflugervilleISD
Moons and Other Bodies
Comets orbit is
elongated.
The tail always
blows away
from the sun
due to solar
winds.
Cite: http://www.lerc.nasa.gov/WWW/ion/past/90s/thumbs/t-borrelly.jpg
Chapter 20 Section 3
Spring 2006, PflugervilleISD
Moons
and
Other
Bodies
Animation of a Comet
Cite: http://spaceplace.jpl.nasa.gov/en/kids/comet_diagram.gif
Chapter 20 Section 3
Spring 2006, PflugervilleISD
Moons and Other Bodies
Let’s look at some photos of
comets : icy bodies that orbit the
sun.
Chapter 20 Section 3
Spring 2006, PflugervilleISD
Pre-AP Extension
What makes a story science fiction? List
the characteristics of a science fiction
story.
Read the story The Mad Moon from Holt
Anthology. Does this story have any of the
characteristic that you listed before you
read the story that makes it science
fiction? If so, what are they?
Chapter 20 Section 3
Spring 2006, PflugervilleISD
Let’s Review
1. When a comet approaches the
sun, why does its tail move away
from the sun?
Chapter 20 Section 3
Spring 2006, PflugervilleISD
Moons and Other Bodies
The solar winds blow the tail away
from the sun.
Chapter 20 Section 3
Spring 2006, PflugervilleISD
Let’s Review
2. Identify and describe how the
solar system is combination of
two or more systems.
Chapter 20 Section 3
Spring 2006, PflugervilleISD
Moons and Other Bodies
The solar system is a large system
that is made up of smaller
systems, such as Jupiter’s
system.
Chapter 20 Section 3
Spring 2006, PflugervilleISD
Rocket Science
Chapter 21 Section 1
Spring 2006, PflugervilleISD
Rocket Science
What Do You Think?
Why can’t a commercial airplane be
used for space exploration?
Chapter 21 Section 1
Spring 2006, PflugervilleISD
Rocket Science
A rocket is a
vehicle or device
that contains all the
substances
needed to burn
fuel, and uses
escaping gas from
the burning of fuel
to move.
Cite: http://www.colman-egan.k12.sd.us/school/clipart/animation%20by%20students%202000/rocket.gif
Chapter 21 Section 1
Spring 2006, PflugervilleISD
Rocket Science
Konstantin Tsiolkovsky
(kahn stan teen tsee uhl
hahv skee) believed that
rockets were the key to
space exploration.
He is known as the
“Father of Rocket
Theory”
Cite:http://www.allstar.fiu.edu/aero/images/Tsiolkovsky.jpg
Chapter 21 Section 1
Spring 2006, PflugervilleISD
Rocket Science
Robert Goddard is
considered the
“Father of modern
rocketry”.
He tested
numerous rockets
between 1915 and
1930.
Chapter 21 Section 1
Spring 2006, PflugervilleISD
Cite: http://cyberquebec.ca/spoutnik/goddard.jpg
Rocket Science
History: During WWII Germany made V-2
rocket to use as a bomb. Wernher von
Braun developed the V-2 rocket but he
wasn’t happy that it was used as bomb.
At the end of WWII, Wernher von Braun
and his team surrendered to the USA.
Chapter 21 Section 1
Spring 2006, PflugervilleISD
Rocket Science
V-2 Rocket
Cite: http://www.daviddarling.info/images/V-2.jpg
Chapter 21 Section 1
Spring 2006, PflugervilleISD
Rocket Science
At the end of WWII, the cold war
(arms race) began with the Soviet
Union.
NASA or the National Aeronautics
and Space Administration formed
as a result to the alarm Americans
felt over Soviet advances in space.
Chapter 21 Section 1
Spring 2006, PflugervilleISD
Cite: http://cgi.cnn.com/TECH/space/9901/04/space.trio/story.nasa.jpg
Rocket Science
Saturn V
Cite: http://www.wilhelm-aerospace.org/Photos/spring-break-03/saturn-v-composite.jpg
Chapter 21 Section 1
Spring 2006, PflugervilleISD
Click for information on
the Saturn V.
Rocket Science
The Saturn V, developed at NASA's Marshall Space
Flight Center under the direction of Wernher von Braun,
was the largest in a family of liquid-propellant rockets
that solved the problem of getting to the Moon. In all, 32
Saturns were launched; not one failed.
The Saturn V was flight-tested twice without a crew. The
first manned Saturn V sent the Apollo 8 astronauts into
orbit around the Moon in December 1968. After two more
missions to test the lunar landing vehicle, in July 1969 a
Saturn V launched the crew of Apollo 11 to the first
manned landing on the Moon.
Chapter 21 Section 1
Spring 2006, PflugervilleISD
Rocket Science
How does a rocket
work? Rockets use
Newton’s Third Law
of Motion: every
action there is an
equal reaction in the
opposite direction.
Turn to page 574 in
your textbook to read
about how rockets
work.
Chapter 21 Section 1
Cite: http://www.astro.psu.edu/xray/rockets/launch_animation.gif
Spring 2006, PflugervilleISD
Rocket Science
Rockets must reach orbital velocity
in order to orbit the Earth. The
lowest speed is 8km/s. Speeds less
then this are suborbital.
Chapter 21 Section 1
Spring 2006, PflugervilleISD
Rocket Science
Escape velocity is the speed and
direction a rocket must move in order
to completely break away from the
planet’s gravitational pull. This speed
is 11km/s.
Chapter 21 Section 1
Spring 2006, PflugervilleISD
Escape Velocity is
about 11km.s.
Suborbital less
than 8km/s.
Orbital Velocity
about 8km/s.
Chapter 21 Section 1
Spring 2006, PflugervilleISD
Rocket Science
Rockets need more
than just fuel to propel
them into space.
They also need
oxygen.
Rockets that go into
space must carry
oxygen with them to
burn their fuel.
Chapter 21 Section 1
Spring 2006, PflugervilleISD
Rocket Science
Click on the following website to see how
the space shuttle engines work or the solid
booster rockets work.
http://www.nasa.gov/centers/kennedy/miss
ions/index-how-it-works.html
Chapter 21 Section 1
Spring 2006, PflugervilleISD
Rocket Science
Activity
Make your own rocket using effervescent
tablets, Fiji film canisters, water,
constructions paper and tape.
Your teacher will place the tablet and
water in the Fiji canister for you.
See speaker notes for lab.
Chapter 21 Section 1
Spring 2006, PflugervilleISD
Let’s Review
1. How does a rocket engine work?
Chapter 21 Section 1
Spring 2006, PflugervilleISD
Rocket Science
Rocket engines use the pressure of
expanding gas to generate thrust.
Newton’s third law of motion
explains why rockets move in a
direction opposite to the direction
of the escaping gas.
Chapter 21 Section 1
Spring 2006, PflugervilleISD
Let’s Review
2. What force must be overcome to
reach outer space?
Chapter 21 Section 1
Spring 2006, PflugervilleISD
Rocket Science
Gravity
Chapter 21 Section 1
Spring 2006, PflugervilleISD
Living and Working in Space
Cite: http://www.harcourtschool.com/explorations/activity/space_station/images/iss_living_in_space.jpg
Chapter 21 Section 4
Spring 2006, PflugervilleISD
Living and Working in Space
What Do You Think?
How can we live in space?
Chapter 21 Section 4
Spring 2006, PflugervilleISD
Living and Working in Space
Yuri Gagarin first Soviet
cosmonaut to orbit the Earth on
April 12,1961.
Allan Shepard first American in
space on May 5, 1961.
Chapter 21 Section 4
Spring 2006, PflugervilleISD
Living and Working in Space
John F. Kennedy’s Speech to send Americans into space.
Because the Soviets were first in space,
they appeared to be winning the Cold War.
President John F. Kennedy made a
speech on May 25, 1961 that challenged
Americans to go to the moon.
Click on the following website to read part of Kennedy’s speech:
http://www1.nasa.gov/vision/space/features/jfk_speech.html
Chapter 21 Section 4
Spring 2006, PflugervilleISD
Living and Working in Space
The Apollo
missions were set
into motion to get
America to the
moon.
Neil Armstrong
became the first
person to set foot
on the moon.
Chapter 21 Section 4
Spring 2006, PflugervilleISD
Cite: http://www.neatherd.org/astronomy/Apollo%2011%20Moon%20Orbit.j
Living and Working in Space
Kennedy’s
challenge was met
on July 20, 1969.
The Apollo 11
landing module
landed on the
moon. “The Eagle
has landed”.
Cite: http://edition.cnn.com/2001/TECH/space/05/25/kennedy.moon/story.kennedy.moon.jpg
Chapter 21 Section 4
Spring 2006, PflugervilleISD
Living and Working in Space
The space shuttle is a
reusable vehicle that
takes off like a rocket
and lands like an
airplane.
First launched in April
12, 1981.
Tragedy struck twiceJanuary 28, 1986 and
February 1, 2003.
Cite: http://content.honeywell.com/dses/assets/product_images/space_shuttle_launch.jpg
Chapter 21 Section 4
Spring 2006, PflugervilleISD
Living and Working in Space
On April 19, 1971 Soviets became
the first to place a manned space
station in space.
A space station is a long-term
orbiting platform from which other
vehicles can be launched or
research carried out.
Chapter 21 Section 4
Spring 2006, PflugervilleISD
Living and Working in Space
Skylab was America’s first space
station. Skylab began to decay in
1979 and fell to the Earth.
In 1986, Soviets began building
the Mir which many countries
visited.
Chapter 21 Section 4
Spring 2006, PflugervilleISD
Living and Working in Space
Cite: http://www.nationmaster.com/images/enc/S/Skylab.jpg
1979 end of Skylab.
Chapter 21 Section 4
Cite: http://www.cosmoworld.ru/mirstation/photos/Mir-v-81.jpg
March 20, 2001 end of Mir.
Spring 2006, PflugervilleISD
Living and Working in Space
In 1993, Russia , the U.S. and many
other countries began building the
ISS or the International Space
Station.
The purpose of the ISS is to conduct
experiments, test new technology and
promote cooperation.
Chapter 21 Section 4
Spring 2006, PflugervilleISD
Living and Working in Space
ISS
Cite:http://www.lunaroutpost.com/gallery/iss/images/iss-gal08.jpg
Chapter 21 Section 4
Spring 2006, PflugervilleISD
Living and Working in Space
Click on the following website to get
updated information on the International
Space Station.
Chapter 21 Section 4
Spring 2006, PflugervilleISD
Pre-AP Extension
How can you build a piece of
equipment that models how
astronauts work in space?
Chapter 21 Section 4
Spring 2006, PflugervilleISD
See speak notes for lab.
Let’s Review
1. How was the race to explore our
solar system influenced by the
Cold War?
Chapter 21 Section 4
Spring 2006, PflugervilleISD
Living and Working in Space
The Cold War tensions greatly
accelerated the space programs
of the United States and the
Soviet Union.
Chapter 21 Section 4
Spring 2006, PflugervilleISD
Let’s Review
2. How did the missions to the
moon benefit space science?
Chapter 21 Section 4
Spring 2006, PflugervilleISD
Living and Working in Space
The missions to the moon helped
us understand the geology of the
moon and measure the solar
wind.
Chapter 21 Section 4
Spring 2006, PflugervilleISD
Let’s Review
3. How will space stations help in
the exploration of space?
Chapter 21 Section 4
Spring 2006, PflugervilleISD
Living and Working in Space
Space stations will serve as
refueling, construction, and
research stations.
Chapter 21 Section 4
Spring 2006, PflugervilleISD