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String Can Telephone

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String Can Telephone National Aeronautics and Space Administration String Can Telephone AGES 5-ADULT OBJECTIVE WHAT YOU’LL NEED BUILDING PROCEDURE With this activity, students will learn how a Two plastic cups 1) Use the push pin to make a hole in the message can be sent and received. In bottom of each cup. addition, students will learn modulation by One push pin 2) Insert one end of the string through one observing sound moving as a wave from of the pin holes. one cup, over the string, to the next up. A piece of string 3) Tie a knot around one of the paper clips on the inside of the cup so that the string Like waves on a pond, a radio wave is a Two paper clips stays attached to the can. Repeat with the series of repeating peaks and valleys. The other cup, paper clip and the other end of entire pattern of a wave, before it repeats You can experiment with materials as an string. The cups should now be connected itself, is called a cycle. The wavelength is engineering project to assess which to each other. the distance a wave takes to complete one materials are best. 4) Hold one cup, and give the other cup to cycle. someone else. Walk away from each other until the string between the cups is tight. In space communications, a radio wave is Speak into the open end of one cup while generated by a transmitter and then your partner listens to the open end of their detected by a receiver. An antenna allows a cup. Change roles and be the listener. radio transmitter to send energy into space 5) Send critical messages to each other. Try and a receiver to pick up energy from space. giving specific actions and see if the Transmitters and receivers are typically receiver performs those actions. designed to operate over a limited range of frequencies. Pretend you are a satellite and a ground antenna sending NASA messages and data back and forth. What does that sound like? What are all the various types of messages that you can communicate? www.nasa.gov National Aeronautics and Space Administration Frequency Board AGES 8-ADULT OBJECTIVE WHAT YOU’LL NEED BUILDING PROCEDURE With this activity, students explore the **Adult Supervision Required** One 12”x12” wooden board electromagnetic spectrum by creating a Infrared Frequency: frequency board. Students will understand 1) Draw two parallel lines two inches apart. Around 70 1” nails wavelengths and phases by comparing radio 2) For the top parallel line, draw around 25 and infrared waves. Students will guess the dots that are approximately one centimeter One hammer length of string it will take to create waves apart. covering the entire board for each. 3) For the bottom parallel line, starting a Yarn centimeter away from the first dot on the top The basic building block of radio parallel line, draw around 25 dots that are Marker communications is a radio wave. Like waves approximately one centimeter apart. on a pond, a radio wave is a series of 4) Hammer in the nails where you marked repeating peaks and valleys. The entire the dots. Make sure the nails are secure. pattern of a wave, before it repeats itself, is Infrared called a cycle. The wavelength is the distance Radio Frequency: a wave takes to complete one cycle. The 1) Draw two parallel lines two inches apart. number of cycles, or times that a wave repeats 2) For the top parallel line, starting as close in a second, is called frequency. to the right edge as possible, draw around 11 Radio dots that are approximately one inch apart. Radio waves range in length from very big like 3) For the bottom parallel line, starting an the size of a tall building to small like the size inch away from the first dot on the top of a coin. Wavelengths that NASA currently parallel line, draw around 11 dots that are communicates with are between the size of a approximately one inch apart. building and the size of a pinhead. NASA uses 4) Hammer in the nails where you marked both radio and infrared waves to the dots. Make sure the nails are secure. communicate. **See image to the left for example.** www.nasa.gov National Aeronautics and Space Administration Engineering Challenge AGE 8-ADULT OBJECTIVE WHAT YOU’LL NEED BUILDING PROCEDURE With this activity, students become Mini Marshmallows 1) Students decide on teams of 2-4. engineers! Engineers are people who 2) All teams receive the same amount of design and build things that we use every Tooth picks or raw spaghetti supplies. day. Most of the time, engineers start with a 3) Each person will take 5 - 7 minutes to question that needs to be answered. Then, Paper sketch out their own engineering plan for they will start solving the problem in the building the antenna or satellite. question by brainstorming a bunch of ideas. 4) The team comes back together sharing Some of the ideas may be simple, and some Pencil or writing instrument each design with one another. The team may be crazy, but it is good to have a lot of than decides which elements to use from different ideas. After coming up with ideas, each drawing to begin building the final engineers will pick a few that make the most product. sense in order to start drawing a plan. After 5) The team has 10-15 minutes to work drawing a plan, an engineering can now together to build one antenna or satellite create something! Once the plan is built, it using only the amount of supplies given to will have to be tested to see what works and them. what does not. Sometimes after testing, the 6) The class will come back together to plan will need to be modified. share designs and discuss. Students will learn the engineering process by working on a team to build an antenna or satellite with a limited amount of supplies. Students will learn team work by collaborating to accomplish the challenge. www.nasa.gov National Aeronautics and Space Administration Networking Activity: Deep Space Network AGE 8-ADULT OBJECTIVE WHAT YOU’LL NEED PROCEDURE With this activity, students will understand a Plastic blow up globe 1) Students volunteer to play the following space communications network by acting roles: Earth, three ground stations and a out NASA’s Deep Space Network (DSN). Ping pong balls spacecraft of choice (i.e. Voyager, New Students will learn that information from Horizons, Juno, etc.) NASA satellites is communicated via radio Plastic Cups 2) Students get into place with the Earth in the frequency. The DSN is demonstrated by center, three ground stations at each sending data from the spacecraft to the appropriate location on the Earth (United ground station and back to the spacecraft. States, Spain and Australia) with their backs to the Earth and facing out towards space The DSN supports NASA and non-NASA holding one cup each. A spacecraft also holds missions that explore the furthest points of a cup and ping-pong balls standing far away our solar system. The DSN has three from Earth on the other side of the room. ground stations located approximately 120 3) The ground stations will stand very close to degrees apart on Earth (120 + 120 + 120 = the Earth and rotate with it. The spacecraft will 360), which is to ensure that any satellite in walk or toss the ping-pong ball, which is a deep space is able to communicate with at representation of data, to the ground station least one station at all times. The ground that is closest to the spacecraft. The ground stations are located in Canberra, Australia; station will then walk or toss the ping-pong ball Madrid Spain; and Goldstone, California. back to the spacecraft. Now, the spacecraft will walk or toss the ping-pong- ball to another To see the real time status of ground station. To make the demonstration communications with our deep space more complex, more students may be added explorers visit: eyes.nasa.gov/dsn/dsn.html as additional spacecraft sending data to the ground stations. www.nasa.gov National Aeronautics and Space Administration Networking Activity: Near Earth Network AGE 8-ADULT OBJECTIVE WHAT YOU’LL NEED PROCEDURE With this activity, students will understand a space Plastic blow up globe 1) Students volunteer to play the following roles: communications network by acting out NASA’s Earth, 5-10 ground stations and a spacecraft of Near Earth Network (NEN). Students will learn that Ping pong balls choice i.e. Geostationary Operational information from NASA satellites is communicated Environmental Satellite (GOES). via radio frequency. The NEN is demonstrated by Plastic Cups 2) Students get into place with the Earth in the sending data from the spacecraft to the ground center, 5-10 ground stations around the Earth station and back to the spacecraft. holding one cup each with their backs to the Earth, and a spacecraft holding a cup and The NEN provides telemetry, commanding, ping-pong balls. ground-based tracking, data and communications 3) The ground stations will stand very close to the services to a wide range of customer with satellites Earth and rotate with it. The spacecraft will walk in low Earth orbit, geosynchronous orbit, highly or toss the ping-pong ball, which is a elliptical orbit, Lunar orbit and missions with representation of data, to one of the ground multiple frequency bands. The NEN dedicates stations. The ground station will then walk or toss ground stations around the world to mission-critical the ping-pong ball back to the spacecraft.
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