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<table>
<tr><td>Across</td> <td>Down</td></tr>
<tr><td>3. unit used to measure distances in space</td><td>1. gamma-rays 
coming up from Earth have been detected during this severe weather 
occurrence</td></tr>

<tr><td>5. GRBs were first detected by satellites looking for ___________  
__________  Ban Treaty violations</td><td>2. scientists estimate the Sun's
lifetime as ten __________  __________</td></tr>

<tr><td>7. average number of GRBs detected daily by satellites</td><td>
4. GRBs are the most powerful ___________ in the Universe</td></tr>

<tr><td>10. a redshift indicates movement in this direction from Earth</td>
<td>6. Cygnus X-1 is an example of one found in our Galaxy</td></tr>

<tr><td>11. acronym for Burst and Transient Source Experiment</td><td>8. 
an object related to a GRB which is discovered by its emission at</td></tr>

<tr><td>12. branch of astronomy dealing with behavior and physical characteristics
 of heavenly bodies</td><td>9. decade in which GRBs were first discovered</td>
</tr>

<tr><td>13. satellite planned for launch in year 2003 to study GRBs</td><td>
9. decade in which GRBs were first discovered</td></tr>

<tr><td>14. optical flash and emission of X-rays occuring immediately after a 
GRB</td><td> </td></tr>
</table>

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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: Thursday, 21-Nov-2002 12:11:31 EST