This is the "Ask an Astrophysicist" service of the
Imagine the Universe! web site. We are a small group of volunteers
who work on space-based astronomical observations, including cosmic-ray,
gamma-ray, and X-ray astrophysics. Our research subjects are often exotic,
like black holes, dark matter, and the origin of the universe.
We have already answered many questions, and have an extensive archive
of past questions and answers. Please consult the archive first to see
if your question has already been answered. We attempt to answer as many
questions as possible, but we are a small group of volunteers and cannot
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on our site, or questions unrelated to space-based astrophysics.
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