Mercury will cross the sun's face from Earth's perspective Monday (May 9) for the first time since 2006, and the last until 2019.
You can watch the 7.5-hour Mercury transit first-hand through a telescope, provided you have the proper solar filters. (Never look directly at the sun without such protection; blindness can result.) Or you can catch the event online; NASA, for example, will broadcast near-real time views from the So...
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