So, there are some really smart people who want to figure out more about Mars, which is a planet that is much further from us than the Moon. Mars is a really interesting planet because it's the most like Earth out of all the other planets. One group of scientists is particularly interested in exploring the caves on Mars.
Caves are like tunnels, but they're made by rocks and dirt and other things underground. On Earth, there are lots of caves that people like to explore. Sometimes people even put on helmets, climb down into a cave, and have to crawl on their hands and knees to explore. These scientists want to figure out if there are caves like this on Mars, because they might have important information about how the planet was formed and whether there is any kind of life on Mars.
But here's the problem: Mars is really far away, and we can't just send people there to explore the caves. Instead, the scientists are going to send some really cool robots to explore the caves for us! These robots are really smart and can move around on their own, kind of like really cool remote-controlled cars. They have cameras on them too, so they can take pictures of everything they see.
The plan is to land the robots near where the caves might be and then send them inside to explore. Because the robots are really small, they can fit in places where people couldn't. That means they might be able to find things that we would never have been able to see before.
Overall, this is a really exciting project and lots of people are looking forward to seeing what the robots find. Who knows, maybe they'll even find some aliens living in the caves!