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Voyage to the Mystery Moon
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Viewing Ideas
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Before Watching
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The evening before showing the program, have students observe
the night sky. Ask them to share their observations the
following day in class. Did they see any stars? Planets? Moons?
Tell students that there are at least 156 moons in our solar
system. Jupiter's moon Ganymede is the largest, and Saturn's
moon Titan is the second largest. (Scientists have currently
identified 47 moons orbiting Saturn.) Both moons are larger than
the planets Mercury and Pluto. Ask student pairs to write a
definition for the term moon. Have pairs share their
definitions, then use definition parts that are accurate to
write a clear definition.
(A moon is a natural satellite rotating around a planet.
Moons are smaller than the planets they orbit. Some moons
might be asteroids captured by planets.)
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Saturn is about 1.3 billion kilometers from Earth (distance when
Saturn and the sun are at opposite sides of the Earth) and has
an equatorial radius about 9.5 times greater than Earth. To help
students better understand the relative distances between, and
the relative sizes of, Earth and Saturn, Earth and its moon, and
Saturn and Titan, use a set of balls and string to represent the
distances and sizes. Provide teams with the following materials:
string, scissors, metric ruler, and four different-sized balls
to represent the celestial bodies (small marble, large marble,
ping pong ball, basketball). Before beginning, have students
predict the distances between Earth and Saturn, Earth and its
moon, and Saturn and Titan. Then write on the board the
information in the first two columns of the "Planet and Moon
Chart" and the "Distances Chart." Also write the string length
for the distance from Earth to Saturn (10 meters).
Tell students that the models they will be making represent
relative, not actual, size differences based on the equatorial
radius of each celestial body. After providing students with the
formula for calculating, have them calculate the ratios as
compared to Earth (Earth = 1), determine which ball to use to
represent each celestial body, and calculate the string lengths
representing the distances between Saturn and Titan, and Earth
and its moon, using the formula provided. Have teams
display the celestial bodies and their relative distances from
each other on the floor in the classroom.
Planet and Moon Chart
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Equatorial Radius (km)
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Ratio (Relative to Earth)
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Ball to Represent Celestial Body
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Earth
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6,378 |
1 |
ping pong ball
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Earth's moon
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1,737 |
0.27 |
small marble |
Saturn
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60,268 |
9.5 |
basketball |
Titan
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2,575 |
0.40 |
large marble |
Formula for calculating ratio relative to Earth:
celestial body's equatorial radius/Earth's equatorial
radius = size relative to Earth
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Distances Chart
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Distance (km)
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String length (meters)
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Earth to Earth's moon
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384,400 |
0.003 m (3 mm)
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Saturn to Titan
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1,221,850 |
0.01 m (1 cm) |
Earth to Saturn
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1,277,420,000 |
10 m |
Formula for calculating string length:
* 10 m/Earth to Saturn distance = X/Saturn to Titan
distance
(Cross-multiply and solve for X or string length for
Saturn to Titan distance)
* 10 m/Earth to Saturn distance = X/Earth to Earth's
moon distance
(Cross-multiply and solve for X or string length for Earth
to Earth's moon distance.)
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Ask pairs of students to calculate how long it would take a
spacecraft traveling in a straight line at 60,000 kilometers per
hour to reach Earth's moon from Earth, Saturn from Earth, and
Titan from Saturn. Tell students that although these numbers aid
in understanding the vast distances between the bodies, they are
not accurate, because spacecraft are sometimes plotted on more
roundabout routes where they can gain an extra boost from
gravitational encounters with planets.
Space Travel at 60,000 km/hr
Destination
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Distance (km)
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Time
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Earth to moon |
384,400 |
6 hours 24 minutes
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Earth to Saturn
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1,277,420,000 |
2 years 5 months
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Saturn to Titan
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1,221,850 |
20 hours 22 minutes
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Organize the class into three groups and as students watch the
program, have each group take notes on one of the following
topics: how the Cassini spacecraft traveled to Saturn, what
Cassini learned about Saturn's rings, and what Cassini and the
Huygens probe revealed about Saturn's moon, Titan.
After Watching
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Have students who took notes on the same topic meet, compare
their notes, and then share what they learned with the class.
What planets gave Cassini an extra boost on its journey to
Saturn? What did scientists learn about the formation of
Saturn's rings? What characteristics about Titan's atmosphere
make it potentially suitable for life?
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The Cassini spacecraft and the Huygens probe are types of
robots. Have students share what they know about robots. Define
the term robot for students.
(A robot is an electronically controlled device that is
capable of performing human tasks, often in harsh or hazardous
environments or in situations in which constant repetitions
are required.)
Ask students if they have or know of any robots that fit this
definition.
(Some examples include self-contained pool vacuum cleaners
and the Mars Pathfinder.)
Ask how the Cassini spacecraft and Huygens probe fit the
definition for a robot.
(They were outfitted with instruments and sent to Saturn to
study the planet, its rings, and its moons. They were
controlled by computers.)
Show students a picture or diagram of the spacecraft. (See Links
& Books for Web sites that include photos and artwork of
Cassini.)
The functions of many spacecraft parts can be compared to humans
or human activities. As a class, discuss the function of some of
the Cassini spacecraft parts, and have students brainstorm a
human parallel or activity related to the function.
Cassini spacecraft part
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Function
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Human parallel or activity
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Huygens Probe
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separates from Cassini and analyzes Titan's atmosphere and
surface
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parachute jumper
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Spacebus
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provides framework for all components
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body's frame |
Engines
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provide thrust for movement
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metabolism, mitochondria in cells
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Computers
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stores and send information
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brain, mind, nervous system
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Antennas
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allow communication between Cassini-Huygens and scientists
on Earth
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hearing and speaking
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Cameras
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take pictures |
sight |
To help students begin to develop a sense of the details
involved in accurately programming spacecraft computers to fly
specific flight paths and perform specific functions (the
Cassini spacecraft has more than 40 computers), pair students
and ask each partner to write directions for a simple task on an
index card. (Tasks might include putting a barrette in hair,
combing hair, putting on a sweater, tying shoes, watering a
plant, or packing a bookbag.) Have each student take turns
reading the steps (without identifying the task) while the other
student (the robot) performs them exactly as they are read. Have
students revise their directions based on how their robot team
member performed the task. When students have finalized their
directions, have each team trade task cards with the nearest
team so that they can test each other's final directions. If
needed, have the teams that now have new sets of directions work
to further refine the directions using the process above before
passing a final set of directions back to the original team for
final testing.
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Currently, scientists have found 47 moons around Saturn.
Organize students into teams and assign the following moons to
teams: Dione, Enceladus, Epimetheus, Hyperion, Iapetus, Janus,
Mimas, Pandora, Phoebe, Prometheus, Rhea, Tethys. Ask each team
to generate five questions and answers related to their assigned
moons. Collect the questions. Allow teams time to learn more
about all the assigned moons from print and Internet resources.
Then hold a moons-of-Saturn trivia contest. (Teams are not
allowed to answer their own questions.) Tally scores on the
board. You might ask the team that correctly answered the
greatest number of questions to teach another class about Saturn
and its moons. (See Links & Books for more resources on
Saturn's moons.)
Web Sites
Cassini-Huygens: Mission to Saturn and Titan
saturn.jpl.nasa.gov/multimedia/images/
Includes images and artwork of the Cassini spacecraft, Saturn,
Saturn's rings, Saturn's moons, and more.
Saturn Controls a Giant Planetary System
www.spacetoday.org/SolSys/Saturn/SaturnMoonsRings.html
Features the latest Cassini news from Saturn and information about
the mission, Saturn's moon, its rings, and other moons of the solar
system.
Saturn's Moons
solarsystem.nasa.gov/planets/profile.cfm?Object=Saturn&Display=Moons
Provides a brief description of some of Saturn's moons.
Saturn's Moons and Rings
www.windows.ucar.edu/tour/link=/saturn/moons_and_rings.html&edu=high
Gives details about some of Saturn's moons.
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