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This is NASA's Laboratory for High Energy Astrophysics (LHEA)
"Ask a High Energy Astronomer" web site. As the name
suggests, we specialize in High Energy Astrophysics. This deals
with the X-ray, Gamma-ray and Cosmic Ray universe;
and covers topics such as black holes, quasars and dark matter.
If you would like to ask a question or see the updated
archive of questions,
please visit us online at
http://imagine.gsfc.nasa.gov/docs/ask_astro/ask_an_astronomer.html.
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Which topic area are you interested in?
(Please select one)
On this CD-ROM, topics that link with  and
 are equivalent; in the online version, only links with allow you to submit new questions. Of questions submitted under the
"General Astronomy & Astrophysics" category, we only
answer those which we consider to be appropriate for this service.
Not sure where your question fits in? If so,
If your question does not fall onto one of the above areas,
it means we are not the appropriate resource for your question.
- Check out the "Who are we"
page, which explains what we study, what questions we'd most like to
answer, and how we fit in with the rest of NASA.
- Try the list of NASA sites (http://spacescience.nasa.gov/questions/)
and a list ofastronomy "Ask an Expert" services (http://dir.yahoo.com/Science/Astronomy/Ask_an_Expert/).
- Also check the AskA+ locator (http://www.vrd.org/locator/subject.shtml)
of the Virtual Reference Desk, to find "Ask an expert" services
on a wider range of subject areas.
- Try a general web search --- a lot of the things are on the web, if only
you knew where to look. Here is an
explanation of how to do a web search.
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