Imagine the Universe!
Imagine Home | Science |

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

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. Barbara Mattson
Curator: Meredith Gibb
Responsible NASA Official: Phil Newman
All material on this site has been created and updated between 1997-2014.
This page last updated: Wednesday, 15-Sep-2004 11:44:23 EDT