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New Astronauts Slideshow

This photo provided by NASA shows Jessica U. Meir. NASA has eight new astronauts _ its first new batch in four years. Meir, Ph.D., 35, is from Caribou, Maine. She is a graduate of Brown University, has an advanced degree from the International Space University, and earned her doctorate from Scripps Institution of Oceanography. Meir currently is an Assistant Professor of Anesthesia at Harvard Medical School, Massachusetts General Hospital, Boston. (AP Photo/NASA)

This photo provided by NASA shows Andrew R. Morgan. NASA has eight new astronauts _ its first new batch in four years. Morgan, a medical doctor, 37, Major, U.S. Army, considers New Castle, Pa., home. Morgan is a graduate of The U.S. Military Academy at West Point, and earned doctorate in medicine from the Uniformed Services University of the Health Sciences, Bethesda, Md. He has experience as an emergency physician and flight surgeon for the Army special operations community, and currently is completing a sports medicine fellowship. (AP Photo/NASA)

This photo provided by NASA shows Josh A. Cassada. NASA has eight new astronauts _ its first new batch in four years. Cassada, originally from White Bear Lake, Minn., is one of the candidates. Cassada is a former naval aviator who holds an undergraduate degree from Albion College, and advanced degrees from the University of Rochester, N.Y. Cassada is a physicist by training and currently is serving as co-founder and Chief Technology Officer for Quantum Opus. (AP Photo/NASA)

This photo provided by NASA shows Christina M. Hammock. NASA has eight new astronauts _ its first new batch in four years. Hammock is one of the candidates. Hammock, 34, calls Jacksonville, N.C. home. Hammock holds undergraduate and graduate degrees from North Carolina State University, in Raleigh, N.C. She currently is serving as National Oceanic and Atmospheric Administration (NOAA) Station Chief in American Samoa. (AP Photo/NASA)
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New Astronauts Slideshow

This photo provided by NASA shows Jessica U. Meir. NASA has eight new astronauts _ its first new batch in four years. Meir, Ph.D., 35, is from Caribou, Maine. She is a graduate of Brown University, has an advanced degree from the International Space University, and earned her doctorate from Scripps Institution of Oceanography. Meir currently is an Assistant Professor of Anesthesia at Harvard Medical School, Massachusetts General Hospital, Boston. (AP Photo/NASA)

This photo provided by NASA shows Andrew R. Morgan. NASA has eight new astronauts _ its first new batch in four years. Morgan, a medical doctor, 37, Major, U.S. Army, considers New Castle, Pa., home. Morgan is a graduate of The U.S. Military Academy at West Point, and earned doctorate in medicine from the Uniformed Services University of the Health Sciences, Bethesda, Md. He has experience as an emergency physician and flight surgeon for the Army special operations community, and currently is completing a sports medicine fellowship. (AP Photo/NASA)

This photo provided by NASA shows Josh A. Cassada. NASA has eight new astronauts _ its first new batch in four years. Cassada, originally from White Bear Lake, Minn., is one of the candidates. Cassada is a former naval aviator who holds an undergraduate degree from Albion College, and advanced degrees from the University of Rochester, N.Y. Cassada is a physicist by training and currently is serving as co-founder and Chief Technology Officer for Quantum Opus. (AP Photo/NASA)

This photo provided by NASA shows Christina M. Hammock. NASA has eight new astronauts _ its first new batch in four years. Hammock is one of the candidates. Hammock, 34, calls Jacksonville, N.C. home. Hammock holds undergraduate and graduate degrees from North Carolina State University, in Raleigh, N.C. She currently is serving as National Oceanic and Atmospheric Administration (NOAA) Station Chief in American Samoa. (AP Photo/NASA)
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New Astronauts Slideshow

This photo provided by NASA shows Jessica U. Meir. NASA has eight new astronauts _ its first new batch in four years. Meir, Ph.D., 35, is from Caribou, Maine. She is a graduate of Brown University, has an advanced degree from the International Space University, and earned her doctorate from Scripps Institution of Oceanography. Meir currently is an Assistant Professor of Anesthesia at Harvard Medical School, Massachusetts General Hospital, Boston. (AP Photo/NASA)

This photo provided by NASA shows Andrew R. Morgan. NASA has eight new astronauts _ its first new batch in four years. Morgan, a medical doctor, 37, Major, U.S. Army, considers New Castle, Pa., home. Morgan is a graduate of The U.S. Military Academy at West Point, and earned doctorate in medicine from the Uniformed Services University of the Health Sciences, Bethesda, Md. He has experience as an emergency physician and flight surgeon for the Army special operations community, and currently is completing a sports medicine fellowship. (AP Photo/NASA)

This photo provided by NASA shows Josh A. Cassada. NASA has eight new astronauts _ its first new batch in four years. Cassada, originally from White Bear Lake, Minn., is one of the candidates. Cassada is a former naval aviator who holds an undergraduate degree from Albion College, and advanced degrees from the University of Rochester, N.Y. Cassada is a physicist by training and currently is serving as co-founder and Chief Technology Officer for Quantum Opus. (AP Photo/NASA)

This photo provided by NASA shows Christina M. Hammock. NASA has eight new astronauts _ its first new batch in four years. Hammock is one of the candidates. Hammock, 34, calls Jacksonville, N.C. home. Hammock holds undergraduate and graduate degrees from North Carolina State University, in Raleigh, N.C. She currently is serving as National Oceanic and Atmospheric Administration (NOAA) Station Chief in American Samoa. (AP Photo/NASA)
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New Astronauts Slideshow

This photo provided by NASA shows Jessica U. Meir. NASA has eight new astronauts _ its first new batch in four years. Meir, Ph.D., 35, is from Caribou, Maine. She is a graduate of Brown University, has an advanced degree from the International Space University, and earned her doctorate from Scripps Institution of Oceanography. Meir currently is an Assistant Professor of Anesthesia at Harvard Medical School, Massachusetts General Hospital, Boston. (AP Photo/NASA)

This photo provided by NASA shows Andrew R. Morgan. NASA has eight new astronauts _ its first new batch in four years. Morgan, a medical doctor, 37, Major, U.S. Army, considers New Castle, Pa., home. Morgan is a graduate of The U.S. Military Academy at West Point, and earned doctorate in medicine from the Uniformed Services University of the Health Sciences, Bethesda, Md. He has experience as an emergency physician and flight surgeon for the Army special operations community, and currently is completing a sports medicine fellowship. (AP Photo/NASA)

This photo provided by NASA shows Josh A. Cassada. NASA has eight new astronauts _ its first new batch in four years. Cassada, originally from White Bear Lake, Minn., is one of the candidates. Cassada is a former naval aviator who holds an undergraduate degree from Albion College, and advanced degrees from the University of Rochester, N.Y. Cassada is a physicist by training and currently is serving as co-founder and Chief Technology Officer for Quantum Opus. (AP Photo/NASA)

This photo provided by NASA shows Christina M. Hammock. NASA has eight new astronauts _ its first new batch in four years. Hammock is one of the candidates. Hammock, 34, calls Jacksonville, N.C. home. Hammock holds undergraduate and graduate degrees from North Carolina State University, in Raleigh, N.C. She currently is serving as National Oceanic and Atmospheric Administration (NOAA) Station Chief in American Samoa. (AP Photo/NASA)