NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington
Mercury glides across our view of the sun on November 11, from 7:35 a.m. to 1:04 p.m. EST. The transit won't happen again until 2032.
To watch, you'll need a telescope or binoculars equipped with a certified solar filter to protect your eyes from damage. Don't ever look directly at the sun.
Here's everything you need to know about the upcoming Mercury transit.
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Mercury is gliding across our view of the sun today in a rare celestial treat.
This event is called a "transit," and it happens when a planet passes between Earth and its star. Within our own solar system, we only see transits of Venus and Mercury, since those are the only planets between us and the sun. But when it comes to other star systems, NASA telescopes can hunt for new exoplanets by watching for tiny dips in a star's brightness caused by transits of orbiting planets.
We won't see a Mercury transit again until 2032. Mercury only makes this transit about 13 times per century.
The last transit was in 2016; NASA satellites recorded footage (below) of the tiny planet crossing the blazing disk of the sun.
Mercury is the smallest planet in our solar system (sorry, Pluto doesn't count), so to watch the transit, you'll need special equipment as well as protection for your eyes.
How to watch the Mercury transit
Mercury will take five-and-a-half hours to cross in front of the sun on Monday.
You should not try to watch this event directly, since you'd risk severe eye damage. (You wouldn't be able to see much with your naked eyes, anyway.) Instead, you'll need a telescope or binoculars with a certified solar filter. Make sure the solar filter is not scratched or damaged before turning your lens to the sun.
The transit began at 7:35 a.m. EST - just after sunrise on the US East Coast. Viewers there are able to watch the entire transit through 1:04 p.m. EST, as are people in Central and South America and some parts of West Africa.
The map below shows which parts of the world can see the event.
The rest of the US sees Mercury's transit at sunrise, and Europe, Africa, and the Middle East will catch it at sunset. Australia and most of Asia are out of luck.
However, anyone can watch the transit on a livestream from NASA's Solar Dynamics Observatory, a sun-orbiting spacecraft. The Virtual Telescope Project has also promised live coverage from Earth-based telescopes.
Don't get your hopes up for a Venus transit next - that won't happen until 2117.
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