Mercury had a rare celestial occurrence on Monday when star watchers watched the planet – in the form of a small black dot – pass between the sun and the earth.
The event, known as Mercury Transit, started around 7:35 am and lasted more than five hours. The smallest planet in the solar system is also the closest to the sun.
The east coast, Canada, South and Central America could see the entire show, weather permitting.
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"Currently, the planet looks like a small defect in the sun's face passing in front of the sun," Space.com reported.
Most of the world took only a small slice of traffic. Observers from Asia and Australia could not see him.
In Maryland, clouds prevented NASA solar astrophysicist Alex Young from sneaking a peek.
"It's a drag, but the whole event was still great," Young wrote in an email to the Associated Press. "Both seeing space and sharing with people from all over the country and the world."
NASA's Solar Dynamics Observatory orbital provided live coverage of the event.
NASA tweeted photos of traffic, including one of Mercury crossing the sun behind the Washington Monument, the nearly invisible planet.
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The event happens only 13 times a century, according to NASA. The last visible traffic on Earth was in 2016.
The next is scheduled to occur in 2032, but will not be visible in North America, which can be seen in 2049.
The Associated Press contributed to this report.