Members of the public met with NASA Mars team members and saw the Perseverance rover and Ingenuity helicopter models up close during a "Roving With Perseverance" tour stop at the Adler Planetarium in Chicago. https://photojournal.jpl.nasa.gov/catalog/PIA25640

Ellen Stofan, Director of Smithsonian's National Air and Space Museum, left, and NASA Administrator Jim Bridenstine look at Jim Lovell's Apollo 8 flight plan with Andrew Johnston, Vice President for Astronomy and Collections at Chicago's Adler Planetarium, during the Smithsonian National Air and Space Museum's Spirit of Apollo event commemorating the 50th anniversary of Apollo 8, Tuesday, Dec. 11, 2018 at the Washington National Cathedral in Washington, DC. Apollo 8 was humanity's first journey to another world, taking astronauts Frank Borman, Jim Lovell, and William Anders to the Moon and back in December of 1968. Photo Credit: (NASA/Joel Kowsky)

Apollo 8 astronaut Jim Lovell, left, Andrew Johnston, Vice President for Astronomy and Collections at Chicago's Adler Planetarium, center, and Ellen Stofan, Director of the Smithsonian's National Air and Space Museum, right, look at Lovell's Apollo 8 flight plan during the Smithsonian National Air and Space Museum's Spirit of Apollo event commemorating the 50th anniversary of Apollo 8, Tuesday, Dec. 11, 2018 at the Washington National Cathedral in Washington, DC. Apollo 8 was humanity's first journey to another world, taking astronauts Frank Borman, Jim Lovell, and William Anders to the Moon and back in December of 1968. Photo Credit: (NASA/Joel Kowsky)

Apollo 8 astronaut Jim Lovell points to the lines from Genesis in his flight plan that were read during a television broadcast by him, Frank Borman, and William Anders as they orbited the Moon on Christmas Eve in 1968, Tuesday, Dec. 11, 2018 at the Washington National Cathedral in Washington, DC. Lovell's flight plan, which is usually displayed at the Adler Planetarium in Chicago, was one of the artifacts from the mission that were on display during the Smithsonian National Air and Space Museum's Spirit of Apollo event commemorating the 50th anniversary of Apollo 8. Apollo 8 was humanity's first journey to another world, taking astronauts Frank Borman, Jim Lovell, and William Anders to the Moon and back in December of 1968. Photo Credit: (NASA/Joel Kowsky)

Don Mitchell, far left, Cassini spacecraft instrument scientist, IBEX co-Investigator, Johns Hopkins University Applied Physics Laboratory in Laurel, Md., answers questions on findings made by NASA's Interstellar Boundary Explorer, IBEX, at NASA Headquarters in Washington, Thursday, Oct. 10, 2009. Mitchell is joined by IBEX mission colleagues David McComas, far right, IBEX spacecraft principal investigator and senior executive director, Space Science and Engineering Division, Southwest Research Institute in San Antonio; Eric Christian, IBEX deputy mission scientist, NASA's Goddard Space Flight Center in Greenbelt, Md.; Rosine Lallement, senior scientist at the French National Center for Scientific Research in Paris; Lindsay Bartolone, second from left, lead of Education and Public Outreach at the Adler Planetarium in Chicago. Photo Credit: (NASA/Carla Cioffi)