1. PHENOMENON

    Rare Venus Sighting Tuesday

    FILE - The planet Venus, black spot, crossing the sun is  photographed through a telescope at Planetarium Urania in Hove, Belgium, in this June 8, 2004 file photo. On June 5, 2012, Venus will pass across the face of the sun, producing a silhouette that no one alive today will likely see again. Transits of Venus are very rare, coming in pairs separated by more than a hundred years. This June's transit, the bookend of a 2004-2012 pair, won't be repeated until the year 2117. Fortunately, the event is widely visible. Observers on seven continents, even a sliver of Antarctica, will be in position to see it.  (AP Photo/Geert Vanden Wijngaert, File)

    Geert Vanden Wijngaert / AP Photo

    Get out your solar eclipse glasses and prepare for a once-in-a-lifetime sighting of Venus. On Tuesday afternoon, the rare transit of Venus—an event that occurs when the planet’s orbit is directly in between the Earth and the sun—will be seen from the U.S. for the last time until 2117. Venus will appear as a tiny black dot floating across the sun’s surface for several hours in the afternoon. Experts warn that special eyewear like solar eclipse glasses are necessary for safe viewing—so hurry to your local planetarium.

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