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Timing Analysis Quiz

  1. Accurate measurements of how a star's apparent brightness changes as a function of time allows

  2. The early calendars were developed based on

  3. Who created a great data bank of observations of the positions of objects in the sky as a function of time?

  4. When a pulsar is moving toward the Earth, its pulse

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.

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Acting Project Leader: Dr. Barbara Mattson
All material on this site has been created and updated between 1997-2012.

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