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starImagine the Universe! The History of Gamma-ray Astronomy
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Library of Past Questions

X-ray/Gamma-ray Astronomy

First time visitors: Please be sure to read our main page!

  • Check out the resource links. These are the sites we often point to in answering your questions.
  • Browse through the library of questions below.
  • Also try our Ask an Astrophysicist Search Engine!.
  • If your question is still not answered, follow the link at the bottom of this page

Library of Past Questions and Answers

    Medical Use and Medical Effects of Radiation

This subject is outside our areas of expertise. You might want to try the Health Physics Society site.
    Electromagnetic Radiation towards the Higher Energies

  1. Where can I get a poster of the Electromagnetic Spectrum?

  2. Where could I find some pictures of UV radiation?

  3. What are the wavelengths and frequency ranges for the subdivisions of the EM Spectrum?

  4. What are X-rays and gamma-rays?

  5. Is there an upper limit to the Electromagnetic Spectrum

    Space Astronomy

  1. What is Space Astronomy?

  2. What are the limitations of ground-based astronomy?

  3. What is astrophysics? What is high energy astrophysics?

    X-rays

  1. How do X-rays work? (from a 5-year old)

  2. Who were some of the pioneers of X-ray astronomy?

  3. How does an X-ray Telescope work?

  4. What are the physical mechanisms that cause X-ray radiation?

  5. Did anyone analyze X-ray emission from Comet Hale-Bopp?

  6. How are X-rays and gamma-rays produced in space?

  7. What are the principle sources of X-rays and gamma-rays?

    Gamma-rays

  1. Who discovered Gamma-rays?

  2. What do Gamma-ray Astronomers do?

  3. Do gamma-rays penetrate our atmosphere?

  4. I have questions about gamma-ray showers and Cerenkov detectors.

  5. Can gamma-rays react with CO2 in our atmosphere? If so, how?

  6. What happens to people who have been exposed to a lot of gamma-rays?

  7. Why are gamma-rays more dangerous than radio waves?

  8. Is it possible to have high-energy gamma-ray emission from de-excitation of nuclei?

  9. Does electron-positron annihilation always yields energy in the gamma-ray band?

  10. What is anti-matter?

Mailbox Do you have a question that isn't answered in our archive?
We do not answer
  • homework questions.
  • term paper or research paper questions.
  • questions asking for science fair project ideas.
  • questions that can be answered by doing a web search (see How to Search the Web)
  • questions unrelated to space-based astrophysics.

  • Special Guidelines for Teachers
  • Ask your question about X-ray/Gamma-ray Astronomy here, if it isn't excluded by the above rules.
    (Sorry, we do not reply via regular mail.)

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    If words seem to be missing from the articles, please read this.

    Imagine the Universe! is a service of the High Energy Astrophysics Science Archive Research Center (HEASARC), Dr. Alan Smale (Director), within the Astrophysics Science Division (ASD) at NASA's Goddard Space Flight Center.

    The Imagine Team
    Project Leader: Dr. Jim Lochner
    Curator:Meredith Gibb
    Responsible NASA Official:Phil Newman
    All material on this site has been created and updated between 1997-2008.
    Last Updated: Monday, 20-Jun-2005 11:00:54 EDT

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