"From our perspective on Earth, we can only ever see Mercury and Venus cross in front of, or transit, the Sun, so it's a rare event you won't want to miss!"
Mercury's transit will be visible across Africa, weather permitting.
In contrast to its 2016 travel, Mercury will score a close to bull's-eye this time, passing for all intents and purposes right on target before our star.
Mercury, the smallest planet in our solar system, began its transit around 5:30 a.m., a journey that takes more than 5 hours to complete.
Rather, you'll need a telescope or binoculars fitted with a special solar filter.
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An event that won't happen again for another 13 years is occurring Monday.
Quoting Professor Mike Cruise, president of the Royal Astronomical Society, Daily mail reports that this occurrences are a visible demonstration of how the planets move around the Sun. The next transit isn't until 2032, and North America won't get another shot until 2049. Doing so will harm your vision, and you won't be able to see Mercury anyway with your naked eyes, even with eclipse glasses - it's just too small. We'll be updating this throughout the transit, so check back for more!
Statistically, every star in the galaxy is alleged to have at least one planet orbiting it. Missions such as Kepler have confirmed the presence of thousands of exoplanets with thousands more waiting to be confirmed.
How to safely look at the Mercury transit?
In spite of the fact that the trek will show up moderate, Mercury will zoom over the sun at about 150,000 miles per hour. "Though it takes Mercury only about 88 days to zip around the sun, its orbit is tilted, so it's relatively rare for the sun, Mercury and Earth to line up perfectly".