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British-born American astronomer
This article is about the astrophysicist. For the American author, see
Roger Angell .
James Roger Prior Angel (born February 7, 1941) is a British-American
astrophysicist known for
telescope design and the development of
spin casting , a technique used to produce mirrors for several of the
largest optical telescopes in the world .
[1]
[2] He is a Regents' Professor of Astronomy and Optical Sciences at the
University of Arizona .
[3]
Education
He graduated from
St Peter's College, Oxford , with a BA, in 1963, from
California Institute of Technology , with an MA in 1966, and from the
University of Oxford , with a D Phil, in 1967.
[1]
Career and research
He has taught at
Columbia University . He is a Fellow of the
Royal Society . He was elected a Fellow of the
American Academy of Arts and Sciences in 1990.
[4]
In 1979, he proposed the
lobster-eye optics principle for
X-rays .
[5]
In 2006, Angel proposed assembling a
space sunshade to mitigate global warming by placing trillions of 0.6-meter, 1-gram disks of
refractive material into stable orbit between the Earth and the Sun (
Lagrange point 1 , or L1 ). The disks would be launched in stacks of 800,000 by
electromagnetic acceleration and transported to L1 (1.5
Gm from Earth) via
ion propulsion . After separation the individual disks would remain in place by autonomously modulating
solar radiation pressure . Together the cloud of disks would deflect 2% of solar radiation onto the Earth, enough to counteract the warming effect of a 100% increase in
atmospheric carbon dioxide from pre-industrial levels. He concluded that such a sunshield "could be developed and deployed in ≈25 years at a cost of a few trillion dollars, <0.5% of world gross domestic product (GDP) over that time."
[6]
On August 23, 2012, Angel and his inventions were the subject of a story on
NPR 's
Morning Edition .
[7]
Awards
References
^
a
b
c
"Roger Angel | American astronomer | Britannica" .
^ Gibbs, Wayt (December 1, 2005).
"Breaking the Mold" . Scientific American .
^
"J. Roger Angel" . The University of Arizona. Retrieved April 2, 2024 .
^
"Book of Members, 1780-2010: Chapter A" (PDF) .
American Academy of Arts and Sciences . Retrieved April 18, 2011 .
^ Hartline, Beverly Karplus (4 January 1980).
"Lobster-Eye X-ray Telescope Envisioned" . Science . 207 (4426): 47–47.
doi :
10.1126/science.207.4426.47 .
ISSN
0036-8075 . Retrieved 29 December 2023 .
^ Angel, Roger (2006-11-14).
"Feasibility of cooling the Earth with a cloud of small spacecraft near the inner Lagrange point (L1)" . Proceedings of the National Academy of Sciences . 103 (46): 17184–17189.
doi :
10.1073/pnas.0608163103 .
ISSN
0027-8424 .
PMC
1859907 .
PMID
17085589 .
^ Palca, Joe (2012-08-23).
"Telescope Innovator Shines His Genius On New Fields" .
NPR .
^
"Fellowships Reward Bright Stars" , Associated Press, The Free Lance-Star , Terri Likens, June 19, 1996
^
"J. Roger P. Angel - Lightweight Mirrors for Astronomical Telescopes" .
National Inventors Hall of Fame . Retrieved June 4, 2016 .
Astrophysics
Maarten Schmidt ,
Donald Lynden-Bell (2008)
Jerry E. Nelson ,
Raymond N. Wilson ,
Roger Angel (2010)
David C. Jewitt ,
Jane Luu ,
Michael E. Brown (2012)
Alan Guth ,
Andrei Linde ,
Alexei Starobinsky (2014)
Ronald Drever ,
Kip Thorne ,
Rainer Weiss (2016)
Ewine van Dishoeck (2018)
Andrew Fabian (2020)
Roger Ulrich ,
Jørgen Christensen-Dalsgaard ,
Conny Aerts (2022)
Nanoscience
Louis E. Brus ,
Sumio Iijima (2008)
Donald Eigler ,
Nadrian Seeman (2010)
Mildred Dresselhaus (2012)
Thomas Ebbesen ,
Stefan Hell ,
John Pendry (2014)
Gerd Binnig ,
Christoph Gerber ,
Calvin Quate (2016)
Emmanuelle Charpentier ,
Jennifer Doudna ,
Virginijus Šikšnys (2018)
Harald Rose ,
Maximilian Haider ,
Knut Urban ,
Ondrej Krivanek (2020)
Jacob Sagiv ,
Ralph G. Nuzzo ,
David L. Allara ,
George M. Whitesides (2022)
Neuroscience
Sten Grillner ,
Thomas Jessell ,
Pasko Rakic (2008)
Richard Scheller ,
Thomas C. Südhof ,
James Rothman (2010)
Cornelia Bargmann ,
Winfried Denk ,
Ann Graybiel (2012)
Brenda Milner ,
John O'Keefe ,
Marcus Raichle (2014)
Eve Marder ,
Michael Merzenich ,
Carla J. Shatz (2016)
A. James Hudspeth ,
Robert Fettiplace ,
Christine Petit (2018)
David Julius ,
Ardem Patapoutian (2020)
Jean-Louis Mandel ,
Harry T. Orr ,
Christopher A. Walsh ,
Huda Zoghbi (2022)
International National Academics Other