The Answers to the 2021 NASA Pi Day Challenge Are Here!

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	Last week, you used pi to solve math problems NASA scientists and engineers use to explore space. Now, you can find out if your answers to the 2021 NASA Pi Day Challenge are correct! Check out the official answer key to see if you've got the makings of a NASA space explorer. Check your answers! Explore more: Why celebrate pi just one day a year? Check out these pi-related activities and resources that you can do all year long below! Plus, join us for an upcoming live stream talk for students all about how we build and operate Mars rovers.

				Upcoming Event MARCH 23, 9 AM PDT Learning Space with NASA Live Stream –Building and Operating a Mars Rover In this live stream for students in grades 5-12, we'll talk about how NASA builds and operates rovers on Mars and build a rubber-band-powered rover together. > Register to ask questions during the live Q&A!

	Pi Day Resources

	Pi in the Sky Lessons Here's everything you need to bring the NASA Pi Day Challenge into the classroom. Mathematics | Grades 4-12 Time: Varies			NASA Pi Day Challenge The entire NASA Pi Day Challenge collection can be found in one, handy slideshow for students. Mathematics | Grades 4-12 Time: Varies

				Mobile & Web Backgrounds Can't get enough pi? Download this year's NASA Pi Day Challenge graphics as mobile phone and web meeting backgrounds: OSIRIS-REx: Mobile | Web Mars Helicopter: Mobile | Web Deep Space Network: Mobile | Web Aurora: Mobile | Web Solar Wind (not pictured): Mobile | Web Medley (not pictured): Mobile | Web

	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.			How Many Decimals of Pi Do We Really Need? While you may have memorized more than 70,000 digits of pi, world record holders, a JPL engineer explains why you really only need a tiny fraction of that for most calculations.			10 Ways to Celebrate Pi Day With NASA on March 14 Find out what makes pi so special, how it’s used to explore space, and how you can join the celebration with resources from NASA.

	Related Lessons for Educators

	Robotic Arm Challenge In this challenge, students will use a model robotic arm to move items from one location to another. They will engage in the engineering design process to design, build and operate the arm. Engineering | Grades K-8 Time: 30-60 minutes			Whip Up a Moon-Like Crater Whip up a moon-like crater with baking ingredients as a demonstration for students. Science | Grades 1-6 Time: 30-60 minutes

	Make a Paper Mars Helicopter In this lesson, students build a paper helicopter, then improve the design and compare and measure performance. Engineering | Grades 2-8 Time: 30-60 minutes			Speaking in Phases Students learn how waves are used in communication between far-away spacecraft and the Deep Space Network on Earth. Science | Grades 3-8 Time: 30-60 minutes			Catching a Whisper from Space Students kinesthetically model the mathematics of how NASA communicates with spacecraft. Mathematics | Grades 4-12 Time: 1-2 hours

	Collecting Light: Inverse Square Law Demo In this activity, students learn how light and energy are spread throughout space. The rate of change can be expressed mathematically, demonstrating why spacecraft like NASA’s Juno need so many solar panels. Science | Grades 6-8 Time: Less than 30 minutes			Build a Relay Inspired by Space Communications In this intermediate-level programming challenge, students use microdevices along with light and mirrors to build a relay that can send information to a distant detector. Technology | Grades 8-12 Time: 1-2 hours			Math Rocks: A Lesson in Asteroid Dynamics Students use math to investigate a real-life asteroid impact. Mathematics | Grades 8-12 Time: 30-60 minutes

	Related Activities for Students

	Code a Mars Helicopter Video Game Create a video game that lets players explore the Red Planet with a helicopter like the one going to Mars with NASA's Perseverance rover! Project | Technology			Make a Paper Mars Helicopter Build a paper helicopter, then see if you can improve the design like NASA engineers did when making the first helicopter for Mars. Project | Engineering

	How Does NASA Spot a Near-Earth Asteroid? Watch this one-minute video to find out how NASA spots and tracks asteroids that fly close to Earth. Video | Science			What's That Space Rock? Find out how to tell the difference between asteroids, comets, meteors, meteorites and other bodies in our solar system. Slideshow | Science

	Share the Pi Day Fun!

				Tell us what you're up to this Pi Day and share your stories and photos on our showcase page. Plus, join the conversation using the hashtag #NASAPiDayChallenge on Facebook, Twitter, and Instagram.

	About Us

				The Education team at NASA's Jet Propulsion Laboratory brings the wonder of NASA missions and science to students and educators to inspire and engage the next generation of explorers. Learn more about our offerings at the links below: Standards-aligned STEM lessons and Teachable Moments for K-12 educators STEM activities for K-12 students STEM internships and research opportunities for college students and faculty Educational programs and networks for informal educators