Neil deGrasse Tyson visits Schriever Air Force Base

Neil deGrasse Tyson, astrophysicist and author, signs a book for an Airman at Schriever Air Force Base, Colorado, Sept. 23, 2019. At the end of his visit to learn more about Schriever Air Force Base, Tyson took time to engage with Airmen. (U.S. Air Force photo by Airman 1st Class Jonathan Whitely)

Neil deGrasse Tyson, astrophysicist and author, talks to Airmen at Schriever Air Force Base, Colorado, Sept. 23, 2019. During his chat with Airmen, Tyson talked about role models, the possibility of going to Mars and the importance of the United States space mission. (U.S. Air Force photo by Airman 1st Class Jonathan Whitely)

Neil deGrasse Tyson, astrophysicist and author, discusses the nuances of the 2nd Space Operations Squadron GPS satellite constellation with wing leadership during a mission brief at Schriever Air Force Base, Colorado, Sept. 23, 2019. The 2nd SOPS GPS satellite constellation supports more than six-billion users globally. (U.S. Air Force photo by Airman 1st Class Jonathan Whitely)

Col. Jack Fischer, 50th Space Wing vice commander, left, stands alongside Neil deGrasse Tyson, astrophysicist and author, while he addresses Airmen at Schriever Air Force Base, Colorado, Sept. 23, 2019. Tyson visited Schriever AFB to understand its mission and to visit with Airmen. (U.S. Air Force photo by Airman 1st Class Jonathan Whitely)

Col. James Smith, 50th Space Wing commander, left, talks to Neil deGrasse Tyson, astrophysicist and author, during a wing mission brief at Schriever Air Force Base, Colorado, Sept 23. 2019. During the mission brief, Tyson learned about the mission, units and mission partners at Schriever AFB. (U.S. Air Force photo by Airman 1st Class Jonathan Whitely)