Jeffrey A. Hoffman
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Jeffrey Alan Hoffman (born November 2, 1944) is an American former
NASA The National Aeronautics and Space Administration (NASA ) is an independent agencies of the United States government, independent agency of the federal government of the United States, US federal government responsible for the United States ...
astronaut An astronaut (from the Ancient Greek (), meaning 'star', and (), meaning 'sailor') is a person trained, equipped, and deployed by a List of human spaceflight programs, human spaceflight program to serve as a commander or crew member of a spa ...
and currently a professor of aeronautics and astronautics at
MIT The Massachusetts Institute of Technology (MIT) is a private research university in Cambridge, Massachusetts, United States. Established in 1861, MIT has played a significant role in the development of many areas of modern technology and sc ...
. Hoffman made five flights as a
Space Shuttle The Space Shuttle is a retired, partially reusable launch system, reusable low Earth orbital spacecraft system operated from 1981 to 2011 by the U.S. National Aeronautics and Space Administration (NASA) as part of the Space Shuttle program. ...
astronaut, including the first mission to repair the
Hubble Space Telescope The Hubble Space Telescope (HST or Hubble) is a space telescope that was launched into low Earth orbit in 1990 and remains in operation. It was not the Orbiting Solar Observatory, first space telescope, but it is one of the largest and most ...
in 1993, when the orbiting telescope's flawed optical system was corrected. Trained as an astrophysicist, he also flew on the 1990 Spacelab Shuttle mission that featured the Astro-1 ultraviolet astronomical observatory in the Shuttle's payload bay. Over the course of his five missions he logged more than 1,211 hours and 21.5 million miles in space. He was also NASA's second
Jewish Jews (, , ), or the Jewish people, are an ethnoreligious group and nation, originating from the Israelites of History of ancient Israel and Judah, ancient Israel and Judah. They also traditionally adhere to Judaism. Jewish ethnicity, rel ...
astronaut, and the second Jewish man in space after Soviet cosmonaut
Boris Volynov Boris Valentinovich Volynov (; born 18 December 1934) is a Soviet Union, Soviet astronaut, cosmonaut who flew two manned space mission, space missions of the Soyuz programme: Soyuz 5, and Soyuz 21. Following the death of Alexei Leonov in October ...
.


Background

Hoffman was born November 2, 1944, in
Brooklyn Brooklyn is a Boroughs of New York City, borough of New York City located at the westernmost end of Long Island in the New York (state), State of New York. Formerly an independent city, the borough is coextensive with Kings County, one of twelv ...
,
New York New York most commonly refers to: * New York (state), a state in the northeastern United States * New York City, the most populous city in the United States, located in the state of New York New York may also refer to: Places United Kingdom * ...
, but considers
Scarsdale, New York Scarsdale is a Administrative divisions of New York#Town, town in Westchester County, New York, United States. The Town of Scarsdale is coterminous municipality, coextensive with the Village of Scarsdale, but the community has opted to operate ...
, to be his hometown. He graduated from
Scarsdale High School Scarsdale High School (SHS) is a four-year public high school in Scarsdale, New York, United States, a coterminous town and village in Westchester County, New York. It is a part of the Scarsdale Union Free School District. The school was founde ...
in 1962, received a BA degree (
summa cum laude Latin honors are a system of Latin phrases used in some colleges and universities to indicate the level of distinction with which an academic degree has been earned. The system is primarily used in the United States. It is also used in some Sout ...
) in
astronomy Astronomy is a natural science that studies celestial objects and the phenomena that occur in the cosmos. It uses mathematics, physics, and chemistry in order to explain their origin and their overall evolution. Objects of interest includ ...
from
Amherst College Amherst College ( ) is a Private college, private Liberal arts colleges in the United States, liberal arts college in Amherst, Massachusetts, United States. Founded in 1821 as an attempt to relocate Williams College by its then-president Zepha ...
in 1966, a
PhD A Doctor of Philosophy (PhD, DPhil; or ) is a terminal degree that usually denotes the highest level of academic achievement in a given discipline and is awarded following a course of graduate study and original research. The name of the deg ...
degree in
astrophysics Astrophysics is a science that employs the methods and principles of physics and chemistry in the study of astronomical objects and phenomena. As one of the founders of the discipline, James Keeler, said, astrophysics "seeks to ascertain the ...
from
Harvard University Harvard University is a Private university, private Ivy League research university in Cambridge, Massachusetts, United States. Founded in 1636 and named for its first benefactor, the History of the Puritans in North America, Puritan clergyma ...
in 1971, and an MSc degree in
materials science Materials science is an interdisciplinary field of researching and discovering materials. Materials engineering is an engineering field of finding uses for materials in other fields and industries. The intellectual origins of materials sci ...
from
Rice University William Marsh Rice University, commonly referred to as Rice University, is a Private university, private research university in Houston, Houston, Texas, United States. Established in 1912, the university spans 300 acres. Rice University comp ...
in 1988. Hoffman is an
Eagle Scout Eagle Scout is the highest rank attainable in the Scouts BSA program of Scouting America. Since its inception in 1911, only four percent of Scouts have earned this rank after a lengthy review process. The Eagle Scout rank has been earned by over ...
. Hoffman is a member of the
International Academy of Astronautics The International Academy of Astronautics (IAA) is a Paris-based non-government association for the field of astronautics. It was founded in Stockholm, Sweden) on August 16, 1960, by Dr. Theodore von Kármán. It was recognised by the United Nation ...
, the
International Astronomical Union The International Astronomical Union (IAU; , UAI) is an international non-governmental organization (INGO) with the objective of advancing astronomy in all aspects, including promoting astronomical research, outreach, education, and developmen ...
, the
American Institute of Aeronautics and Astronautics The American Institute of Aeronautics and Astronautics (AIAA) is a professional society for the field of aerospace engineering Aerospace engineering is the primary field of engineering concerned with the development of aircraft and spacecra ...
, the
American Astronomical Society The American Astronomical Society (AAS, sometimes spoken as "double-A-S") is an American society of professional astronomers and other interested individuals, headquartered in Washington, DC. The primary objective of the AAS is to promote the adv ...
, the Spanish Academy of Engineering,
Phi Beta Kappa The Phi Beta Kappa Society () is the oldest academic honor society in the United States. It was founded in 1776 at the College of William & Mary in Virginia. Phi Beta Kappa aims to promote and advocate excellence in the liberal arts and sciences, ...
, and
Sigma Xi Sigma Xi, The Scientific Research Honor Society () is an international non-profit honor society for scientists and engineers. Sigma Xi was founded at Cornell University by a faculty member and graduate students in 1886 and is one of the oldest ...
. he is co-director of the Massachusetts Space Grant Consortium and a professor of the Practice in the Department of Aeronautics and Astronautics at
MIT The Massachusetts Institute of Technology (MIT) is a private research university in Cambridge, Massachusetts, United States. Established in 1861, MIT has played a significant role in the development of many areas of modern technology and sc ...
.


Academic experience

Hoffman's original research interests were in high-energy astrophysics, specifically cosmic
gamma ray A gamma ray, also known as gamma radiation (symbol ), is a penetrating form of electromagnetic radiation arising from high energy interactions like the radioactive decay of atomic nuclei or astronomical events like solar flares. It consists o ...
and
x-ray An X-ray (also known in many languages as Röntgen radiation) is a form of high-energy electromagnetic radiation with a wavelength shorter than those of ultraviolet rays and longer than those of gamma rays. Roughly, X-rays have a wavelength ran ...
astronomy. His doctoral work at Harvard was the design, construction, testing, and flight of a
balloon A balloon is a flexible membrane bag that can be inflated with a gas, such as helium, hydrogen, nitrous oxide, oxygen, or air. For special purposes, balloons can be filled with smoke, liquid water, granular media (e.g. sand, flour or rice), ...
-borne, low-energy, gamma ray
telescope A telescope is a device used to observe distant objects by their emission, Absorption (electromagnetic radiation), absorption, or Reflection (physics), reflection of electromagnetic radiation. Originally, it was an optical instrument using len ...
. From 1972 to 1975, during post-doctoral work at the
University of Leicester The University of Leicester ( ) is a public university, public research university based in Leicester, England. The main campus is south of the city centre, adjacent to Victoria Park, Leicester, Victoria Park. The university's predecessor, Univ ...
in the United Kingdom, he worked on several x-ray astronomy
rocket A rocket (from , and so named for its shape) is a vehicle that uses jet propulsion to accelerate without using any surrounding air. A rocket engine produces thrust by reaction to exhaust expelled at high speed. Rocket engines work entirely ...
payloads. He also designed and supervised the construction and testing of the test equipment for use in an x-ray beam facility which he used to measure the scattering and reflectivity properties of x-ray concentrating
mirror A mirror, also known as a looking glass, is an object that Reflection (physics), reflects an image. Light that bounces off a mirror forms an image of whatever is in front of it, which is then focused through the lens of the eye or a camera ...
s. During his last year at Leicester, he was project scientist for the medium-energy x-ray experiment on the
European Space Agency The European Space Agency (ESA) is a 23-member International organization, international organization devoted to space exploration. With its headquarters in Paris and a staff of around 2,547 people globally as of 2023, ESA was founded in 1975 ...
's
EXOSAT The European X-ray Observatory Satellite (EXOSAT), originally named HELOS, was an X-ray telescope operational from May 1983 until April 1986 and in that time made 1780 observations in the X-ray band of most classes of astronomical object includi ...
satellite A satellite or an artificial satellite is an object, typically a spacecraft, placed into orbit around a celestial body. They have a variety of uses, including communication relay, weather forecasting, navigation ( GPS), broadcasting, scient ...
and played a leading role in the proposal and design studies for this project. He worked in the
Center for Space Research The MIT School of Science is one of the five schools of the Massachusetts Institute of Technology, located in Cambridge, Massachusetts, United States. The School, which consolidated under the leadership of Karl Taylor Compton in 1932, is composed ...
at the
Massachusetts Institute of Technology The Massachusetts Institute of Technology (MIT) is a Private university, private research university in Cambridge, Massachusetts, United States. Established in 1861, MIT has played a significant role in the development of many areas of moder ...
(MIT) from 1975 to 1978 as project scientist in charge of the orbiting HEAO-1 A4 hard x-ray and gamma ray experiment, launched in August 1977. His involvement included pre-launch design of the data analysis system, supervising its operation post-launch, and directing the MIT team undertaking the scientific analysis of flight data being returned. He was also involved extensively in analysis of x-ray data from the SAS-3 satellite being operated by MIT. His principal research was the study of x-ray bursts, about which he authored or co-authored more than 20 papers. He joined the MIT Aeronautics and Astronautics faculty in 2001 as a senior lecturer, and since 2002 has been a professor of the Practice in that department. His research specialties include human space flight operations, space flight technology, human-machine interactions, extravehicular activity, and conducting laboratory research in space. His teaching interests include space systems design and space policy. Dr. Hoffman instructed a course in systems engineering on the space shuttle that is available for free in video format from academic earth.


NASA experience

Selected by NASA in January 1978, Hoffman became an astronaut in August 1979. During preparations for the Shuttle Orbital Flight Tests, he worked in the Flight Simulation Laboratory at
Downey, California Downey is a city located in Southeast Los Angeles County, California, United States, southeast of Downtown Los Angeles. It is considered part of the Gateway Cities. The city is the birthplace of the Apollo space program and Taco Bell. It is ...
, testing
guidance Guidance may refer to: Arts and media * Guidance (album), ''Guidance'' (album), by American instrumental rock band Russian Circles * Guidance (film), ''Guidance'' (film), a Canadian comedy film released in 2014 * Guidance (web series), ''Guidance ...
,
navigation Navigation is a field of study that focuses on the process of monitoring and controlling the motion, movement of a craft or vehicle from one place to another.Bowditch, 2003:799. The field of navigation includes four general categories: land navig ...
and flight control systems. He worked with the orbital maneuvering and reaction control systems, with Shuttle navigation, with crew training, and with the development of satellite deployment procedures. Hoffman served as a support crewmember for
STS-5 STS-5 was the fifth NASA Space Shuttle mission and the fifth flight of the Space Shuttle ''Columbia''. It launched on November 11, 1982, and landed five days later on November 16, 1982. STS-5 was the first Space Shuttle mission to deploy comm ...
and as a CAPCOM (spacecraft communicator) for the
STS-8 STS-8 was the eighth NASA Space Shuttle mission and the third flight of the Space Shuttle ''Challenger''. It launched on August 30, 1983, and landed on September 5, 1983, conducting the first night launch and night landing of the Space Shuttl ...
and
STS-82 STS-82 was the 22nd flight of the Space Shuttle Space Shuttle Discovery, ''Discovery'' and the 82nd mission of the Space Shuttle program. It was NASA's second mission to service the Hubble Space Telescope, during which ''Discovery's'' crew repai ...
missions. He also worked on EVA, including the development of a high-pressure
spacesuit A space suit (or spacesuit) is an environmental suit used for protection from the harsh Space environment, environment of outer space, mainly from its Vacuum (outer space), vacuum as a highly specialized pressure suit, but also its temperatu ...
, and preparations for the assembly of the
Space Station A space station (or orbital station) is a spacecraft which remains orbital spaceflight, in orbit and human spaceflight, hosts humans for extended periods of time. It therefore is an artificial satellite featuring space habitat (facility), habitat ...
. Hoffman was a co-founder of the Astronaut Office Science Support Group. In 1996 he led the Payload and Habitability Branch of the Astronaut Office. Among the Jewish items he took into space were a
Dreidel A dreidel, also dreidle or dreidl, ( ; , plural: ''dreydlech''; ) is a four-sided spinning top, played with during the Jewish holiday of Hanukkah. The dreidel is a Jewish variant on the teetotum, a gambling toy found in Europe and Latin America ...
, which he spun for an hour, a
Mezuzah A ''mezuzah'' ( "doorpost"; plural: ''mezuzot'') is a piece of parchment inscribed with specific Hebrew language, Hebrew verses from the Torah, which Jews affix in a small case to the doorposts of their homes. These verses are the Biblical pa ...
, which he attached to the space station bunk bed he and fellow Jewish astronaut Scott J. Horowitz alternately used, and a
Hanukkah Hanukkah (, ; ''Ḥănukkā'' ) is a Jewish holidays, Jewish festival commemorating the recovery of Jerusalem and subsequent rededication of the Second Temple at the beginning of the Maccabean Revolt against the Seleucid Empire in the 2nd ce ...
menorah. Hoffman left the astronaut program in July 1997 to become NASA's European Representative in
Paris Paris () is the Capital city, capital and List of communes in France with over 20,000 inhabitants, largest city of France. With an estimated population of 2,048,472 residents in January 2025 in an area of more than , Paris is the List of ci ...
, where he served until August 2001. His principal duties were to keep NASA and NASA's European partners informed about each other's activities, try to resolve problems in US-European cooperative space projects, search for new areas of US-European space cooperation, and represent NASA in European media. In August 2001, Hoffman was seconded by NASA to the Massachusetts Institute of Technology, where he is a professor in the Department of Aeronautics and Astronautics. He is engaged in several research projects using the
International Space Station The International Space Station (ISS) is a large space station that was Assembly of the International Space Station, assembled and is maintained in low Earth orbit by a collaboration of five space agencies and their contractors: NASA (United ...
and teaches courses on space operations and design.


Space flight experience

* STS 51-D (April 12–19, 1985) *
STS-35 STS-35 was the tenth flight of Space Shuttle ''Columbia'', the 38th shuttle mission. It was devoted to astronomical observations with ASTRO-1, a Spacelab observatory consisting of four telescopes. The mission launched from Kennedy Space Cent ...
(December 2–10, 1990) *
STS-46 STS-46 was a NASA Space Shuttle mission using and was launched on July 31, 1992, and landed on August 8, 1992. Crew Crew seat assignments Mission highlights Gallery File:Sts046-99-039 - cropped.jpg, EURECA after deployment File ...
(July 31 – August 8, 1992) *
STS-61 STS-61 was NASA's first Hubble Space Telescope servicing mission, and the fifth flight of the Space Shuttle Endeavour, Space Shuttle ''Endeavour''. The mission launched on December 2, 1993, from Kennedy Space Center (KSC) in Florida. The missi ...
(December 2–13, 1993) *
STS-75 STS-75 was a 1996 NASA Space Shuttle mission, the 19th mission of the orbiter. Crew Crew seat assignments Mission objective Tethered Satellite System The primary objective of STS-75 was to carry the Tethered Satellite System Reflight (TS ...
(February 22 – March 9, 1996) Hoffman made his first space flight as a mission specialist on STS 51-D, April 12–19, 1985, on the Space Shuttle ''Discovery''. On this mission, he made the first STS contingency spacewalk, in an attempted rescue of a malfunctioning satellite. Hoffman made his second space flight as a mission specialist on
STS-35 STS-35 was the tenth flight of Space Shuttle ''Columbia'', the 38th shuttle mission. It was devoted to astronomical observations with ASTRO-1, a Spacelab observatory consisting of four telescopes. The mission launched from Kennedy Space Cent ...
, December 2–10, 1990, on the Space Shuttle ''Columbia''. This Spacelab mission featured the ASTRO-1
ultraviolet Ultraviolet radiation, also known as simply UV, is electromagnetic radiation of wavelengths of 10–400 nanometers, shorter than that of visible light, but longer than X-rays. UV radiation is present in sunlight and constitutes about 10% of ...
astronomy laboratory, a project on which Hoffman had worked since 1982. Hoffman made his third space flight as payload commander and mission specialist on
STS-46 STS-46 was a NASA Space Shuttle mission using and was launched on July 31, 1992, and landed on August 8, 1992. Crew Crew seat assignments Mission highlights Gallery File:Sts046-99-039 - cropped.jpg, EURECA after deployment File ...
, July 31 – August 8, 1992, on the Space Shuttle ''Atlantis''. On this mission, the crew deployed the European Retrievable Carrier (EURECA), an ESA-sponsored free-flying science platform, and carried out the first test flight of the Tethered Satellite System (TSS), a joint project between NASA and the
Italian Space Agency The Italian Space Agency (; ASI) is a government agency established in 1988 to fund, regulate and coordinate space exploration activities in Italy. The agency cooperates with numerous national and international entities who are active in aerospac ...
. Hoffman had worked on the Tethered Satellite project since 1987. Hoffman made his fourth flight as an EVA crewmember on
STS-61 STS-61 was NASA's first Hubble Space Telescope servicing mission, and the fifth flight of the Space Shuttle Endeavour, Space Shuttle ''Endeavour''. The mission launched on December 2, 1993, from Kennedy Space Center (KSC) in Florida. The missi ...
, December 2–13, 1993, on the Space Shuttle ''Endeavour''. During this flight, the
Hubble Space Telescope The Hubble Space Telescope (HST or Hubble) is a space telescope that was launched into low Earth orbit in 1990 and remains in operation. It was not the Orbiting Solar Observatory, first space telescope, but it is one of the largest and most ...
(HST) was captured, serviced, and restored to full capacity through a record five spacewalks by four astronauts, including Hoffman. Hoffman also spun a
dreidel A dreidel, also dreidle or dreidl, ( ; , plural: ''dreydlech''; ) is a four-sided spinning top, played with during the Jewish holiday of Hanukkah. The dreidel is a Jewish variant on the teetotum, a gambling toy found in Europe and Latin America ...
for the holiday of
Hanukkah Hanukkah (, ; ''Ḥănukkā'' ) is a Jewish holidays, Jewish festival commemorating the recovery of Jerusalem and subsequent rededication of the Second Temple at the beginning of the Maccabean Revolt against the Seleucid Empire in the 2nd ce ...
to a live audience watching via satellite. Hoffman last flew on
STS-75 STS-75 was a 1996 NASA Space Shuttle mission, the 19th mission of the orbiter. Crew Crew seat assignments Mission objective Tethered Satellite System The primary objective of STS-75 was to carry the Tethered Satellite System Reflight (TS ...
(February 22 – March 9, 1996) on the Space Shuttle ''Columbia''. This was a 16-day mission whose principal payloads were the reflight of the Tethered Satellite System (TSS) and the third flight of the United States
Microgravity Weightlessness is the complete or near-complete absence of the sensation of weight, i.e., zero apparent weight. It is also termed zero g-force, or zero-g (named after the g-force) or, incorrectly, zero gravity. Weight is a measurement of the fo ...
Payload (USMP-3). The TSS successfully demonstrated the ability of tethers to produce electricity. The TSS experiment produced a wealth of new information on the
electrodynamics In physics, electromagnetism is an interaction that occurs between particles with electric charge via electromagnetic fields. The electromagnetic force is one of the four fundamental forces of nature. It is the dominant force in the interacti ...
of tethers and
plasma physics Plasma () is a state of matter characterized by the presence of a significant portion of charged particles in any combination of ions or electrons. It is the most abundant form of ordinary matter in the universe, mostly in stars (including th ...
before the tether broke at 19.7 km, just shy of the 20.7 km goal. The crew also worked around the clock performing combustion experiments and research related to USMP-3 microgravity investigations. During this mission, Hoffman became the first astronaut to log 1000 hours aboard the Space Shuttle. Hoffman took with him a small Torah scroll, and he read from the
Book of Genesis The Book of Genesis (from Greek language, Greek ; ; ) is the first book of the Hebrew Bible and the Christian Old Testament. Its Hebrew name is the same as its incipit, first word, (In the beginning (phrase), 'In the beginning'). Genesis purpor ...
during the flight. The documentary film "Space Torah" released in 2023, is centered around this event. With the completion of his fifth space flight, Dr. Hoffman has logged more than 1,211 hours and 21.5 million miles in space.


After NASA

Since 2002, he has been a professor of the Practice in the Department of Aeronautics and Astronautics at the
Massachusetts Institute of Technology The Massachusetts Institute of Technology (MIT) is a Private university, private research university in Cambridge, Massachusetts, United States. Established in 1861, MIT has played a significant role in the development of many areas of moder ...
. Since 2008 he has also been a visiting professor at the Department of Physics and Astronomy at the University of Leicester. He is the author of a book titled ''An Astronaut's Diary'' (June 1986) which is accompanied by a cassette tape. The audio tape contains excerpts of the original recordings he made with a pocket tape recorder. Hoffman is a visiting lecturer at the
International Space University The International Space University (ISU) is a higher education institute headquartered in Illkirch-Graffenstaden, a suburb of Strasbourg, France. It is dedicated to the discovery, research, and development of outer space and its applications f ...
.


Awards and honors

*Amherst College 1963 Porter Prize in Astronomy *1964 Second Walker Prize in Mathematics *1965 John Summer Runnells Scholarship Prize *1966 Stanley V. and Charles B. Travis Prize *Woods Prize for Scholarship *Elected to Phi Beta Kappa in 1965 and Sigma Xi in 1966 *Woodrow Wilson Foundation Pre-Doctoral Fellowship, 1966–67 *National Science Foundation Pre-Doctoral Fellowship, 1966–1971 *National Academy of Sciences Post-Doctoral Visiting Fellowship, 1971–72 *Harvard University Sheldon International Fellowship, 1972–73 *
NATO The North Atlantic Treaty Organization (NATO ; , OTAN), also called the North Atlantic Alliance, is an intergovernmental organization, intergovernmental Transnationalism, transnational military alliance of 32 Member states of NATO, member s ...
Post-Doctoral Fellowship, 1973–74 *
NASA Space Flight Medal The NASA Space Flight Medal is a decoration of the National Aeronautics and Space Administration. According to its statutes, it is awarded "for significant achievement or service during individual participation as a civilian or military astronau ...
s (5) *
NASA Exceptional Service Medal The NASA Exceptional Service Medal is an award granted to U.S. government employees for significant sustained performance characterized by unusual initiative or creative ability that clearly demonstrates substantial improvement in engineering, a ...
s (2) *
NASA Distinguished Service Medal The NASA Distinguished Service Medal is the highest award that can be bestowed by the National Aeronautics and Space Administration of the United States. The medal may be presented to any member of the federal government, including both milita ...
s (2) *V. M. Komarov and the
Sergei P. Korolev Sergius is a male given name of Ancient Rome, Ancient Roman origin after the name of the Latins, Latin ''gens'' Gens Sergia, Sergia or Sergii of Roman Kingdom, regal and Roman Republic, republican ages. It is a common Christian name, in honour of ...
Diplomas by the International Aeronautical Federation in 1991 and 1994 *Inducted into the Astronaut Hall of Fame in 2007


See also

* History of the Jews in Houston


References


External links

*
BBC World Service Discovery programme with Jeffrey Hoffman on the Shuttle, needs Real Audio player
{{DEFAULTSORT:Hoffman, Jeffrey A. 1944 births 20th-century American Jews Amherst College alumni Academics of the University of Leicester Harvard University alumni Living people MIT School of Engineering faculty People from Scarsdale, New York Rice University alumni NASA civilian astronauts Scarsdale High School alumni Space Shuttle program astronauts United States Astronaut Hall of Fame inductees Spacewalkers 21st-century American Jews