Update: March 15, 2018 – The answers to the 2018 NASA Pi Day Challenge are here! View the illustrated answer key
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The 2018 NASA Pi Day Challenge
Can you solve these stellar mysteries with pi? Click to get started.
Pi Day, the annual celebration of one of mathematics’ most popular numbers, is back! Representing the ratio of a circle’s circumference to its diameter, pi has many practical applications, including the development and operation of space missions at NASA’s Jet Propulsion Laboratory.
The March 14 holiday is celebrated around the world by math enthusiasts and casual fans alike – from memorizing digits of pi (the current Pi World Ranking record is 70,030 digits) to baking and eating pies.
JPL is inviting people to participate in its 2018 NASA Pi Day Challenge – four illustrated math puzzlers involving pi and real problems scientists and engineers solve to explore space, also available as a free poster! Answers will be released on March 15.
Why March 14?
Pi is what’s known as an irrational number, meaning its decimal representation never ends and it never repeats. It has been calculated to more than one trillion digits, but NASA scientists and engineers actually use far fewer digits in their calculations (see “How Many Decimals of Pi Do We Really Need?”). The approximation 3.14 is often precise enough, hence the celebration occurring on March 14, or 3/14 (when written in U.S. month/day format). The first known celebration occurred in 1988, and in 2009, the U.S. House of Representatives passed a resolution designating March 14 as Pi Day and encouraging teachers and students to celebrate the day with activities that teach students about pi.
NASA’s Pi Day Challenge
Lessons: Pi in the Sky
Explore the entire NASA Pi Day Challenge lesson collection, including free posters and handouts!
To show students how pi is used at NASA and give them a chance to do the very same math, the JPL Education Office has once again put together a Pi Day challenge featuring real-world math problems used for space exploration. This year’s challenge includes exploring the interior of Mars, finding missing helium in the clouds of Jupiter, searching for Earth-size exoplanets and uncovering the mysteries of an asteroid from outside our solar system.
Here’s some of the science behind this year’s challenge:
Scheduled to launch May 5, 2018, the InSight Mars lander will be equipped with several scientific instruments, including a heat flow probe and a seismometer. Together, these instruments will help scientists understand the interior structure of the Red Planet. It’s the first time we’ll get an in-depth look at what’s happening inside Mars. On Earth, seismometers are used to measure the strength and location of earthquakes. Similarly, the seismometer on Insight will allow us to measure marsquakes! The way seismic waves travel through the interior of Mars can tell us a lot about what lies beneath the surface. This year’s Quake Quandary problem challenges students to determine the distance from InSight to a hypothetical marsquake using pi!
Also launching in spring is NASA’s Transiting Exoplanet Survey Satellite, or TESS, mission. TESS is designed to build upon the discoveries made by NASA’s Kepler Space Telescope by searching for exoplanets – planets that orbit stars other than our Sun. Like Kepler, TESS will monitor hundreds of thousands of stars across the sky, looking for the temporary dips in brightness that occur when an exoplanet passes in front of its star from the perspective of TESS. The amount that the star dims helps scientists determine the radius of the exoplanet. Like those exoplanet-hunting scientists, students will have to use pi along with data from Kepler to find the size of an exoplanet in the Solar Sleuth challenge.
Jupiter is our solar system’s largest planet. Shrouded in clouds, the planet’s interior holds clues to the formation of our solar system. In 1995, NASA’s Galileo spacecraft dropped a probe into Jupiter’s atmosphere. The probe detected unusually low levels of helium in the upper atmosphere. It has been hypothesized that the helium was depleted out of the upper atmosphere and transported deeper inside the planet. The extreme pressure inside Jupiter condenses helium into droplets that form inside a liquid metallic hydrogen layer below. Because the helium is denser than the surrounding hydrogen, the helium droplets fall like rain through the liquid metallic hydrogen. In 2016, the Juno spacecraft, which is designed to study Jupiter’s interior, entered orbit around the planet. Juno’s initial gravity measurements have helped scientists better understand the inner layers of Jupiter and how they interact, giving them a clearer window into what goes on inside the planet. In the Helium Heist problem, students can use pi to find out just how much helium has been depleted from Jupiter’s upper atmosphere over the planet’s lifetime.
In October 2017, astronomers spotted a uniquely-shaped object traveling in our solar system. Its path and high velocity led scientists to believe ‘Oumuamua, as it has been dubbed, is actually an object from outside of our solar system – the first ever interstellar visitor to be detected – that made its way to our neighborhood thanks to the Sun’s gravity. In addition to its high speed, ‘Oumuamua is reflecting the Sun’s light with great variation as the asteroid rotates on its axis, causing scientists to conclude it has an elongated shape. In the Asteroid Ace problem, students can use pi to find the rate of rotation for ‘Oumuamua and compare it with Earth’s rotation rate.
Join the Conversation
- Join the conversation and share your Pi Day Challenge answers with @NASAJPL_Edu on social media using the hashtag #NASAPiDayChallenge
- Pi Day: What’s Going ‘Round – Tell us what you’re up to this Pi Day and share your stories and photos with NASA.
- Pi in the Sky 5
- Pi in the Sky 4
- Pi in the Sky 3
- Pi in the Sky 2
- Pi in the Sky
- Pi in the Sky Challenge (slideshow for students)
- 18 Ways NASA Uses Pi – Whether it's sending spacecraft to other planets, driving rovers on Mars, finding out what planets are made of or how deep alien oceans are, pi takes us far at NASA. Find out how pi helps us explore space.
- Kepler-186f Travel Poster
- Video: First Interstellar Asteroid Wows Scientists
- Planet Pi
Facts and Figures
TAGS: Pi Day, Math, Science, Engineering, NASA Pi Day Challenge, K-12, Lesson, Activity, Slideshow, Mars, Jupiter, Exoplanets, Kepler, Kepler-186f, Juno, InSight, TESS, ‘Oumuamua, asteroid, asteroids, NEO, Nearth Earth Object
Today, after spending 340 days aboard the International Space Station on a mission to better understand the bodily impacts of extended stays in space, NASA astronaut Scott Kelly will begin his return trip to Earth.
Kelly's mission is a key step in NASA's Journey to Mars, which aims to send American astronauts deeper into space and, eventually, all the way to Mars – on missions lasting more than 900 days.
To get astronauts to Mars, scientists and engineers won't only need to study how such a journey might affect the human body, but also invent new modes of transportation that can land astronauts on the Red Planet and then launch them back to Earth; find efficient ways to supply astronauts with food, water and oxygen; and develop systems for living and working on Mars.
As a leading center for robotic exploration of the solar system, NASA's Jet Propulsion Laboratory may not seem like it has much to do with sending humans to Mars. But actually, JPL scientists and engineers are helping lay much of the groundwork (sometimes literally!) for NASA's Journey to Mars. The Curiosity, Spirit and Opportunity rovers as well as the Mars Reconnaissance Orbiter have spent years on and around Mars collecting science that may help identify a landing location for a human mission, determine the kinds of science that astronauts will do, and discover key info about surviving in the harsh environment. And a number of other missions and technologies being developed at JPL – Low-Density Supersonic Decelerator (LDSD), Mars 2020 and Mars Sample Return, to name a few – are helping to bring astronauts one small step closer to Mars.
Learn more about the Journey to Mars and get students involved with these activities and resources:
Lessons and Activities
Multimedia and Interactives
- One-Year Crew Image Gallery
- One-Year Crew YouTube Playlist
- NASA's Journey to Mars graphic
- How Astronauts are Affected by Space Exploration interactive (requires Flash)
Join the Conversation
- Follow astronaut Scott Kelly on Twitter
- Reddit Ask Me Anything with scientists and medical doctors from NASA’s Johnson Space Center (Friday, March 4)
UPDATE - Aug. 31, 2016: Our Mars Bulletin Board materials are out of stock. To download and print out the resources, click on the links next to each product.
Get the school year back in gear with a Mars-themed bulletin board for your school, classroom, library or educational program. The Educator Resource Center at NASA's Jet Propulsion Laboratory is offering a set of free posters and lithographs with fun facts about the Red Planet and NASA's Mars missions.
The Mars Bulletin Board includes:
This poster highlights the likenesses and differences between the Red Planet and Earth.
This lithograph set features images of NASA's Mars rover Curiosity as well as images the rover has taken on the Red Planet. Facts about Curiosity and its discoveries are included on the back of each image.
Learn about the twin Mars Exploration Rovers, Spirit and Opportunity, and their key discoveries. (Opportunity is still roving on Mars, more than 10 years after landing on the Red Planet!)
As part of its "Journey to Mars" initiative, NASA is developing spacecraft and technologies that will pave the way for a future manned mission to the Red Planet. This graphic shows some of the key milestones of that initiative.
Learn about the history, composition and exploration of Mars on this lithograph featuring images of the Red Planet on one side and fun facts on the other.
UPDATE - Sept. 9, 2015: Registration for “Send Your Name to Mars” aboard InSight is now closed. Visit the Send Your Name website to be alerted to future opportunities. The next chance to send your name to Mars will be aboard Exploration Mission 1.
Send your name to Mars on NASA's next journey to the Red Planet! Visit the Fly Your Name page by September 8 to have your name added to a silicon microchip headed to the Red Planet aboard NASA's InSight Mars lander.
The InSight mission is scheduled to land on Mars on Sept. 28, 2016 to investigate the deep interior and seismology of the planet. This is the first time such a study has been done on Mars and scientists are hoping it will uncover important details about Martian quakes, the interior structure of Mars and the evolution of all rocky planets, including Earth.
Participants in this fly-your-name opportunity will earn "frequent-flier" points as part of NASA's Journey to Mars campaign. Started with the December 2014 flight of NASA's Orion spacecraft, the campaign offers several opportunities to send your name to Mars -- and collect points -- on NASA missions preparing for human exploration of the Red Planet.
UPDATE - March 17, 2014: The pi challenge answer key is now available for download.
In honor of everyone's favorite mathematical holiday, Pi Day, which celebrates the mathematical constant 3.14 on March 14, NASA/JPL Edu has crafted a set of stellar middle- and high-school math problems to show students that pi is more than just a fancy number.
Pi is all over our skies! It helps power our spacecraft, keeps our Mars rovers' wheels spinning, lets us peer beneath the clouds on Jupiter and gives us new perspectives on Earth. Take part in the fun and see if your classroom can solve some of the same problems that real NASA scientists and engineers do.
Each pi-filled word problem gets a graphic treatment in this printable infographic (available in both poster-size and 8.5-by-11 handouts) that helps students visualize the steps they need to get to a solution. A companion answer key is also available below and walks students through each step of the solutions. It can be printed on the back of the problem-set infographic for an educational classroom poster.
"Pi in the Sky" Downloads:
Two weeks before I returned to NASA's Jet Propulsion Laboratory in Pasadena, Calif., for my second internship working on projects with the Deep Space Network and the Department of Defense, something special happened. I was poised to present my research from JPL and Montana State University's Space Science and Engineering Laboratory -- where I've been building cube-satellites while going to school -- as part of the Montana Space Grant Consortium Research Symposium. The crowd was full of distinguished scientists and professors, but there was one face that stood out among the rest. She helped send robots to Mars, she's a famous public speaker, and she has a passion for space exploration. But more than that, her perseverance and drive are an inspiration to me. (Plus, like me, she's from Montana!)
The face I was looking at was that of Jaime Waydo, the mobility team lead mechanical systems engineer for NASA's next Mars rover, Curiosity, which is scheduled to land on Mars on August 5. An MSU mechanical engineering alum, Jaime went through the same program and schooling that I'm going through and was returning to her alma mater to speak to the next generation of explorers and engineers after working on two successful Mars rover missions and leading the mobility team on a third. Space Grant, the program that brought me to JPL for my internship, thought it would be a great idea that Jaime and I meet. (Little did I know she would be listening to my speeches!) What follows is our conversation, which not only highlighted the power of education -- and my JPL internship -- but also reaffirmed my passion to reach for the stars.
Me: Do you giggle every night when you go to bed knowing that you work for JPL?
Jaime: Umm, yes ... a little bit. I remember one time my boss looked at me and said, "Jaime, you've been putting in a ton of hours, we can get you some overtime pay," and I looked at him and I said, "I can't believe I get paid to work here!"
Me: When you were growing up in Montana, did you ever think that you would someday be working for NASA, or was that a childhood goal?
Jaime: In our science class in seventh grade, we learned about NASA's Viking spacecraft landing on Mars, and I was especially attracted to Viking because it landed the year I was born. I looked at my teacher and said, "I'm going to build stuff that will go to Mars!" The stars aligned, and I got to go to JPL at a time when there were Mars missions all the time. And I got to work on two of the most famous Mars landings of all time and soon to be a third. It's been a great career.
Me: How did you get to JPL?
Jaime: I was working at Perkins Family Restaurant during school at MSU in Bozeman, Montana. A couple would come in and eat everyday at 4 p.m., and one day the lady pulled me aside and said, "What are you doing with your life? I don't want you to be a waitress forever." And I said, "I go to school at MSU. I'm a mechanical engineer student, and my dream is to go work at JPL in California." The lady said, "My brother just retired from there. I'll bring him in." Two weeks later, her brother came in to Perkins and took my resume. Then, a week later, the famous Don Bickler [who leads the Advanced Mechanical Systems team for JPL] called. Don brought me in to JPL, where the stars aligned again, and gave me an internship in the group that was designing mobility systems to go to Mars. It was everything I had ever wanted.You learn to be really sharp when you work for Don. He's the father and inventor of Martian mobility.
Me: With all the pressure and stress of flight missions and landing on Mars, how do you leave the office and go home to a family and sleep?
Jaime: When you are on a flight project, everybody is 100 percent committed, and you know that even if your system is having bugs or not working today, other people are pulling it up by its bootstraps and helping to fix the problem. It's an incredible team that works at JPL, and you will never find, I don't think, in one spot, so many talented people in one place.
Me: Tell me about the bogie joint on Curiosity that you worked on and helped design for the rover. Is that new to suspension or mobility systems on rovers?
Jaime: No, it's not new; it's a take off of old train technology. It balances the weight between the two wheels. Sojourner had it, Spirit and Opportunity had it, and now Curiosity has it. When I started working on Curiosity, JPL asked me to run the mobility team, and I said ok, but I want to do hardware too. I was worried about a career trajectory that would take me into management and not be so technical, and I still really wanted to be technical. I'm really proud of the fact that I ran this amazing team of highly creative, talented people who allowed me to be a manager, and build hardware like the bogie joint at the same time, and to fulfill a lifelong dream of building hardware to go to Mars. [I look over at my father backstage who just retired from 46.5 years on the railroad, and Jaime says to him, "Bill, I bet there was a bogie joint on the train!" He grins from ear to ear and says, "Yep!"]
Me: Tell me about this? [I show Jaime a picture that I took at JPL last summer of a huge pink steel platform that was used as a test bed to work on the mobility system for the rover.]
Jaime: [laughing] that's called the "Pink Pig." It's a piece of support equipment for the rover mobility system. I decided that we needed a little bit of "girl" in the mobility team. I was the only girl on the mobility team for a long time, and if I could do anything to make girls more excited about science and engineering, then I was going to do it. I figured that if girls saw this huge pink piece of equipment, and realized that a girl had been there and done that and worked on the rover, it would make girls excited. And it did. Engineering school is really hard: the all night studying, the thermodynamics. The fact that I made it through engineering school still blows my mind. It was tunnel vision focus to get to JPL to be on that spacecraft team. If I can do it, then I want to inspire other girls to go for it as well.
Not only does Jaime continue to inspire girls and boys alike, she inspires countless students and future engineers. She has a way of making you feel like you have the right stuff and should continue to shoot for the stars. The next time I see Jaime will be at JPL on August 5, when Curiosity is scheduled to land on Mars. On that night, when I look toward Mars in the sky, I'll know that Jaime was a part of paving the way for space exploration, my greatest passion.