President Obama hosts second White House Astronomy Night (8 images)

President Barack Obama delivers remarks at the second White House Astronomy Night with students, teachers, scientists, astronauts and others attending the event in the South Lawn of the White House in Washington, DC on October 19, 2015. Obama encouraged young people to pursue careers in science. Pool Photo by Aude Guerrucci/UPI

President Barack Obama delivers remarks and gets ready to look through a telescope at the second White House Astronomy Night with students, teachers, scientists, astronauts and others attending the event in the South Lawn of the White House in Washington, DC on October 19, 2015. Pool Photo by Aude Guerrucci/UPI

Student Ahmed Mohamed, who was arrested when he brought a homemade clock to school in Irving, Texas, takes part in the second White House Astronomy Night hosted by President Barack Obama on the South Lawn of the White House in Washington, DC on October 19, 2015. Pool Photo by Aude Guerrucci/UPI

President Barack Obama delivers remarks at the second White House Astronomy Night with students, teachers, scientists, astronauts and others attending the event in the South Lawn of the White House in Washington, DC on October 19, 2015. Pool Photo by Aude Guerrucci/UPI