Moonfall is a movie that tells the story of what would happen if the moon was going to crash into the Earth. The moon is really big and it's very important because it's what makes the tides go in and out.
In the movie, some people on Earth discover that the moon is breaking apart and falling towards our planet. This is very scary because if the moon hits the Earth, it would cause huge disasters like earthquakes, tsunamis, and even maybe the end of the world.
A group of brave people decide to try to stop the moon from crashing into the Earth. They go on a big spaceship to the moon and try to use special weapons to break it into smaller pieces so it won't hurt the Earth as much.
But it's not easy to stop the moon and they face many challenges along the way. They have to work together and be very brave to save the Earth from the moonfall.
So, in short, Moonfall is a movie about people trying to save the Earth from a falling moon. It's scary but also exciting to see if they can do it!