Webster Cash

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Department of Astrophysical and Planetary Sciences
Center for Astrophysics and Space Astronomy
University of Colorado
Campus Box 389
Boulder, CO 80309-0389

    Department of Astrophysical and Planetary Sciences
    Department of Aerospace Engineering Sciences

    Research Office: ARL 175C
              Phone: 303-492-4056
    Teaching Office: Duane F913
               Phone 303-492-0354

    Email: webster.cash@colorado.edu

Go to Home Page for Stars and Galaxies (ASTR 1200) FALL 2014


  • ASTR 3800 -- Data Analysis and Computing                  Spring 2013, Spring 2011
  • ASTR 3730 -- Astrophysics 1                                         Fall, 2013, Fall 2012
  • ASTR 1030 -- Astronomy 1                                           Fall 2010
  • ASTR 1020 -- Astronomy 1                                           Spring 2010
  • ASTR 2600 -- Computational Techniques                       Fall     2009
  • ASTR 3830 -- Astrophysics 2                                        Spring 2009

Research Interests:

  • Design, fabrication, and use of instrumentation for visible, ultraviolet and x-ray bands.
  • Development of grazing incidence techniques for imaging and spectroscopy in the x-ray.
  • New techniques for planet finding.

Planet Finding

The last decade has seen the opening of studies of planets around other stars, yet we still must infer their existence indirectly. I am working on alternative optical techniques that can lead to direct observation of these exo-planets.

X-ray Interferometry

For the last few years I have been trying to invent a new way of looking at objects in the sky.  X-rays, with their very short wavelengths have much lower diffraction effects than visible light and radio waves.  Therefore, if the right instrument can be built, astronomers would be able to view the sky with unprecedented resolution. The eventual goal of x-ray interferometry is to take a picture of black hole.

X-ray Spectroscopy

We are now actively engaged in developing diffraction gratings for the Constellation-X Mission. We are investigating the use of "off-plane" reflection gratings with the goal of improved spectral resolution.

Information on travel to Boulder can be found at Boulder Travel Information