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Astronomers all over the world have been watching a sight that happens only 12 times a century.
The planet Mercury has been passing across the Sun in an event known as a transit.
Scientists warned people not to look directly at the Sun because it can permanently damage their eyes.
The only completely safe way is to project an image of the Sun on a white surface, like a piece of paper or cardboard.
Lots of people have been watching it on the internet instead.
Mercury started crossing the Sun just after 6am UK time and at least part of its five-hour trek was visible from everywhere in the world - except Antarctica.
The planet Mercury has been passing across the Sun in an event known as a transit.
Scientists warned people not to look directly at the Sun because it can permanently damage their eyes.
The only completely safe way is to project an image of the Sun on a white surface, like a piece of paper or cardboard.
Lots of people have been watching it on the internet instead.
Mercury started crossing the Sun just after 6am UK time and at least part of its five-hour trek was visible from everywhere in the world - except Antarctica.