Ask a High-Energy Astronomer

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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.

We attempt to answer as many questions as possible, but because of the volume of email we receive, we are unfortunately often unable to answer all of them.

We will not respond to questions whose answers may be found in our archive or on our site, or questions unrelated to high energy astrophysics.

We do not accept more than 1 question per email and no more than 1 question per week from an individual user.
Educators, please see Special Guidelines for Teachers.
It usually takes 1-2 weeks for our volunteers to answer a question. If we are especially busy, it may take longer.

Which topic area are you interested in?
(Please select one)

	Astrobiology (exoplanets, life in space)		Neutron Stars/Pulsars
	Astronomy as a Profession		Night Sky (stars, planets & more)
	Binary Star Systems		Physics of Stars
	Black Holes		Quasars & Active Galaxies
	Cosmic Rays		Relativity
	Cosmology		Satellites & Space Technology
	Dark Matter		Solar System
	Earth and Moon (also calendars)		Space Travel & Exploration
	Gamma-ray Bursts		Supernovae and Their Remnants
	Milky Way and other Galaxies		X-ray/Gamma-ray Astronomy

General Astronomy & Astrophysics

Please note that topic links with take you to an archive of questions & answers and other resources, but will not allow you to submit new questions.

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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 and a list of astronomy "Ask an Expert" services.
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Ask a High Energy Astronomer

Which topic area are you interested in? (Please select one)

Please note that topic links with take you to an archive of questions & answers and other resources, but will not allow you to submit new questions.

Which topic area are you interested in?
(Please select one)