Exploration Flight Test 1 was the first test flight of NASA's Orion Multi-Purpose Crew Vehicle. It launched on December 5, 2014 from Cape Canaveral, Florida and spent approximately 4 hours in space.
The items flew "some 3,600 miles above Earth and [would] come back to take prized spots on the Sesame Street set where millions of children will watch." NASA blog editor Steven Siceloff continued:
“The symbolism and chance to touch something that has been in space has proven a powerful enticement to those who can't make the trip themselves. Medals, flags, pins and patches that have ventured into orbit adorn museum displays around the world and are often placed in prominent locations in schools so students can ponder the universe and their effect on it.[1]”
The event was covered in social media by various accounts held by Sesame Workshop and NASA, and the items ultimately returned to their owners by astronaut Ricky Arnold on July 9, 2015.
During the build-up to Orion's launch, NASA announced a media campaign advertise the event: "Over the next ten days, NASA and Sesame Street will share comic strips, videos and graphics of some of their most popular Muppet characters interacting with Orion concepts to help build awareness of human spaceflight, Orion’s flight test and NASA’s Journey to Mars."[3]
October 30, 2014 "This worm is going to Mars."
November 25, 2014 "Elmo shows off his boarding pass for Orion's test flight"
November 25, 2015 "9 days to go before @NASA_Orion's launch! Did you know that there are 970 tiles to protect its shell from high temps?"
November 26, 2014 "#8daystogo until the Orion test flight launches! Did you know that there are three motors in the launch abort tower? The abort motor, attitude control motor and jettison motor. Wow!"
November 28, 2014 "No monster loves flying more than Super Grover! There are only #6daystogo until NASA's test flight. Did you know that Orion's parachutes have to perform well enough to make sure that future missions are safe? So good luck, parachutes!"
November 29, 2014 "5 days until launch! Orion’s first flight on December 4th is the first step in the Journey to Mars. The Yip Yips, Sesame Street’s Martian friends, are patiently awaiting our arrival. #SesameStreet #JourneyToMars"
November 30, 2015 "Four days until @NASA_Orion's test flight! Check out Elmo, Abby and Cookie signing Sesame Street's #ImOnBoard banner!"
December 2, 2014 "Have you heard? Slimey is headed back to space on Orion’s first flight!!! Only #2daystogo!"
December 3, 2014 "Astronaut Ricky Arnold and Astronaut Elmo visit the launch pad before Orion's first flight."
December 3, 2014 "Elmo has completed the inspection of Launch Pad 37. We are go for launch!"
July 7, 2015 "Cookie Monster likes cookies straight from the oven. They look like Orion's heat shield, but are not as hot. During flight our heat shield protected us from 4000°F, 10 times hotter than temperature required to bake cookies. The temperature was caused by Orion slamming into the atmosphere at 20,000mph - this is much faster than most ovens can travel."
July 7, 2015 "Slimey's family Eartha, Dusty, and Sloppy welcome him home. Slimey flew on the Orion Spacecraft last December. Orion can carry a crew of 4. Slimey and his family are welcome on board!"
July 8, 2015 "Ernie's Rubber Duckie flew on Orion and landed in his bathtub! Orion landed in a much bigger bathtub after flight, the Pacific Ocean. The US Navy helped pull Orion out of the ocean just like Ernie puts Rubber Duckie up after bath time. Orion landed right on target and the US Navy used a single ship to scoop up Orion and take it to San Diego, California where it was put on a truck and driven to Kennedy Space Center in Florida."
July 8, 2015 "Sesame Street's Super Grover is pretty fast when he flies through the sky. We have to be faster to break away from earth’s gravity."
July 8, 2015 "Grover’s cape protects him and gives him super powers. More so now that it has been to space on Orion. Orion doesn't have a cape but we do have tiles that wrap around to protect us from heat and debris. The lightweight tiles are similar to ones used on the Space Shuttle and are used to cover the top part of Orion. Orion also uses a large heat shield on the bottom to protect it against the heat of reentry - 4000°F!"
July 9, 2015 "Yes! Rubber Duckie back on @SesameStreet. Reunited with best friend, Ernie!"
July 9, 2015 "On Orion @SesameStreet Super Grover's cape flew faster than a speeding bullet!"