Mike Buckley, senior public information office at the Johns Hopkins University Applied Physics Laboratory speaks at the beginning of a press conference prior to the flyby of Ultima Thule by the New Horizons spacecraft, Monday, Dec. 31, 2018 at Johns Hopkins University Applied Physics Laboratory (APL) in Laurel, Maryland. Photo Credit: (NASA/Joel Kowsky)

Mike Buckley, senior public information officer at the Johns Hopkins University Applied Physics Laboratory is seen during a press conference after the team received confirmation from the New Horizons spacecraft that it has completed the flyby of Ultima Thule, Tuesday, Jan. 1, 2019 at Johns Hopkins University Applied Physics Laboratory (APL) in Laurel, Maryland. Photo Credit: (NASA/Joel Kowsky)

Mike Buckley, senior public information officer at the Johns Hopkins University Applied Physics Laboratory, left, and New Horizons encounter mission manager Mark Holdridge of the Johns Hopkins University Applied Physics Laboratory, right, watch a live feed of the Mission Operations Center (MOC) along with guests and New Horizons team members as they wait to receive confirmation from the spacecraft that it has completed the flyby of Ultima Thule, Tuesday, Jan. 1, 2019 at Johns Hopkins University Applied Physics Laboratory (APL) in Laurel, Maryland. Photo Credit: (NASA/Joel Kowsky)