Imagine the Universe!
retry

You're pretty close! The edge of the star can be hard to discern, but it is somewhere in the orange, as opposed to red, part of the image (there is some stellar atmosphere showing in the image). Make your measurements carefully (it may help to print out the Web page and make your measurements from the printout, rather than from the computer screen). Then try your calculation again.

Return Return to try this calculation again.

Experiment Return to the beginning and try another experiment.

Imagine the Universe is a service of the High Energy Astrophysics Science Archive Research Center (HEASARC), Dr. Nicholas White (Director), within the Laboratory for High Energy Astrophysics at NASA's Goddard Space Flight Center.

The Imagine Team
Project Leader: Dr. Jim Lochner
All material on this site has been created and updated between 1997-2004.

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