Starting at 7 a.m. ET Monday morning, Mercury will be visible as a small, dark circle going across the sun.
Mercury passing in front of the sun happens just 13 times a century — the last time was in 2006 — and the event will last in the United States for at least seven hours. NASA says it will be visible in the Americas, Europe, Africa, and large parts of Asia, and has a warning — in order to see Mercury, don't stare at the sun, but instead use a "telescope or high-powered binoculars fitted with solar filters made of specially-coated glass or Mylar."
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