Bulgarian Minister of Finance Assen Vassilev, center, and Bulgarian Ambassador to the United States Georgi Panayotov, right, are seen as they meet with NASA Administrator Bill Nelson, Wednesday, Feb. 7, 2024, at the Mary W. Jackson NASA Headquarters building in Washington. Photo Credit: (NASA/Joel Kowsky)

Bulgarian Ambassador to the United States Georgi Panayotov, left, NASA Administrator Bill Nelson, center, and Bulgarian Minister of Finance Assen Vassilev, right, pose for a picture prior to a meeting at the Mary W. Jackson NASA Headquarters building, Wednesday, Feb. 7, 2024, in Washington. Photo Credit: (NASA/Joel Kowsky)

Bulgarian Minister of Finance Assen Vassilev, center, and Bulgarian Ambassador to the United States Georgi Panayotov, second from right, are seen as they meet with NASA Administrator Bill Nelson, Wednesday, Feb. 7, 2024, at the Mary W. Jackson NASA Headquarters building in Washington. Photo Credit: (NASA/Joel Kowsky)

NASA Administrator Bill Nelson, left, speaks with Bulgarian Minister of Finance Assen Vassilev, center, and Bulgarian Ambassador to the United States Georgi Panayotov, right, during a meeting at the Mary W. Jackson NASA Headquarters building, Wednesday, Feb. 7, 2024, in Washington. Photo Credit: (NASA/Joel Kowsky)

Ambassador of Bulgaria to the United States Georgi Panayotov delivers remarks during an Artemis Accords signing ceremony Thursday, Nov. 9, 2023, at the Mary W. Jackson NASA Headquarters building in Washington. Bulgaria is the 32nd country to sign the Artemis Accords, which establish a practical set of principles to guide space exploration cooperation among nations participating in NASA’s Artemis program. Photo Credit: (NASA/Keegan Barber)

Ambassador of Bulgaria to the United States Georgi Panayotov, left, delivers remarks during an Artemis Accords signing ceremony as NASA Administrator Bill Nelson, second from left, Minister of Innovation and Growth for Bulgaria Milena Stoycheva, second from right, and U.S. Department of State Deputy Assistant Secretary Sonata Coulter, right, look on, Thursday, Nov. 9, 2023, at the Mary W. Jackson NASA Headquarters building in Washington. Bulgaria is the 32nd country to sign the Artemis Accords, which establish a practical set of principles to guide space exploration cooperation among nations participating in NASA’s Artemis program. Photo Credit: (NASA/Keegan Barber)

U.S. Department of State Deputy Assistant Secretary Sonata Coulter, right, delivers remarks during an Artemis Accords signing ceremony as Ambassador of Bulgaria to the United States Georgi Panayotov, left, NASA Administrator Bill Nelson, second from left, Minister of Innovation and Growth for Bulgaria Milena Stoycheva, second from right, look on Thursday, Nov. 9, 2023, at the Mary W. Jackson NASA Headquarters building in Washington. Bulgaria is the 32nd country to sign the Artemis Accords, which establish a practical set of principles to guide space exploration cooperation among nations participating in NASA’s Artemis program. Photo Credit: (NASA/Keegan Barber)

NASA Administrator Bill Nelson, left, delivers remarks during an Artemis Accords signing ceremony as Ambassador of Bulgaria to the United States Georgi Panayotov, second from left, Minister of Innovation and Growth for Bulgaria Milena Stoycheva, second from right, and U.S. Department of State Deputy Assistant Secretary Sonata Coulter, right, look on, Thursday, Nov. 9, 2023, at the Mary W. Jackson NASA Headquarters building in Washington. Bulgaria is the 32nd country to sign the Artemis Accords, which establish a practical set of principles to guide space exploration cooperation among nations participating in NASA’s Artemis program. Photo Credit: (NASA/Keegan Barber)

Minister of Innovation and Growth for Bulgaria Milena Stoycheva, second from right, delivers remarks during an Artemis Accords signing ceremony as NASA Press Secretary Jackie McGuinness, left, Ambassador of Bulgaria to the United States Georgi Panayotov, second from left, NASA Administrator Bill Nelson, third from left, and U.S. Department of State Deputy Assistant Secretary Sonata Coulter, right, look on Thursday, Nov. 9, 2023, at the Mary W. Jackson NASA Headquarters building in Washington. Bulgaria is the 32nd country to sign the Artemis Accords, which establish a practical set of principles to guide space exploration cooperation among nations participating in NASA’s Artemis program. Photo Credit: (NASA/Keegan Barber)