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Ask an Astrophysicist

This is the "Ask an Astrophysicist" service of the Imagine the Universe! web site. We specialize in cosmic-ray, gamma-ray, and X-ray astrophysics, and other satellite based astronomical observations. Our research subjects are often exotic, like 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.
    During the holiday season, it is likely to take longer.

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

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

Red * General Astronomy & Astrophysics

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

Not sure where your question fits in? If so,
  • Read an explanation of these topic areas.
  • Or type a key word or phrase into our LIBRARY SEARCH ENGINE --- your question may already have been answered on our site.
If your question does not fall onto one of the above areas, it means we are not the appropriate resource for your question.



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: Tuesday, 25-Nov-2008 13:15:42 EST