If you thought the moon looked bigger and brighter than usual this weekend - you weren't imagining things - it was!
It was a super moon! It happens when the full moon is at its closest point to Earth during its orbit of our planet.
This weekend the super moon was the best we've seen for almost 20 years.
The moon's orbit is an oval shape so the size of the full moon that we see can vary. Here are people in the London Eye getting a great view of the super moon.
A super moon can look 14% bigger and up to 30% brighter than a normal full moon.
It looked cool, but it can cause problems for ships. The moon affects tides at sea so when the moon is closer, it can change the pattern of the waves.