The best sight of the week in our night sky will be the closing pairing of Mars and Regulus, the star that marks the heart of Leo the Lion. Details of this event are given at the end of this column. Our main topic comes first. That topic is the 100th anniversary of the most mysterious explosion in history, an apparently astronomical happening called the Tunguska Event.
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This week we have the astronomical start of summer. We also have the lowest full moon of the year, the closest approach of the far-flung world Pluto, the moon near Jupiter in our sky, and - last but not least - a symmetrical triangle of two planets and a bright star.
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The moon swells to full over the course of the next eight nights. But it is not bright enough to overwhelm completely the sky's brightest stars and planets. Seeing those lights in the sky is one of our topics this week. So, too, are the moon's amazing close conjunctions (meetings) with two objects: the international space station and the bright star Antares.
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