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  • ASTROPHYSICS  (2)
  • 2000-2004
  • 1985-1989  (2)
  • 1989  (2)
  • 1
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    A second supernova inside Puppis A? (1989)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Narrow-band images of an unusual swirl structure located near the center of the Puppis A supernova remnant are presented which reveal three overlapping filamentary systems of highly diverse composition. One is dominated by emission lines of nitrogen, one by oxygen, and one by sulfur. Spectra indicate that these small rings have high velocities and a corresponding kinematic age of less than 800 yr. Heavy-element abundances are extremely high and different in each system, some reminiscent of knots in Cas A, and others of circumstellar matter observed surrounding supernova 1987A. The youth and unusual chemistry lead to the suggestion that a second supernova has exploded within the shell of Puppis A, giving rise to the swirl structure.
    Keywords: ASTROPHYSICS
    Type: Nature (ISSN 0028-0836); 337; 48-50
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    The inverse-square law and quantum gravity (1989)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: A program is described which measures the gravitational acceleration of antiprotons. This idea was approached from a particle physics point of view. That point of view is examined starting with some history of physics over the last 200 years.
    Keywords: ASTROPHYSICS
    Type: NASA, Relativistic Gravitational Experiments in Space; p 55-58
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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