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This debate has been recently rekindled since the discovery of 2003 UB 313. 
(90 sec.)

California Academy of Sciences Sky Tour Podcast

 

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A useful, fun, and interesting way to look at the night-time sky. (90 sec) 
California Academy of Sciences Sky Tour Podcast

 

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Look for changes in the night-time sky now that spring has arrived. (90 sec) 
California Academy of Sciences Sky Tour Podcast

 

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Report of recent exploration of Mars by NASA’s Rover