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Space Trivia Contest Entry Form

 

What letter is used to classify the most powerful class of solar flares, as observed from near Earth in X-rays?  (Using the most popular system now in use.)

DEADLINE IS WEDNESDAY, MAY 3, 2017, AT 8AM PACIFIC TIME.

This week's prizes are a Planetary Radio t-shirt, now available in both men’s and women’s styles, and a 200-point iTelescope.net astronomy account.

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