Vande Hei and Acaba at Walt Whitman Middle School

NASA astronauts Mark Vande Hei, left, and Joe Acaba answer questions during a presentation to students at Walt Whitman Middle School, Thursday, June 14, 2018 in Alexandria, Va. Acaba and astronaut Mark Vande Hei answered questions from the audience and spoke about their experiences aboard the International Space Station for 168 days as part of Expedition 53 and 54. Photo Credit: (NASA/Joel Kowsky)