Coherent space is like a big, empty room with everything organized in a very neat way. Imagine your toy box, with all your toys in their proper places. When everything is in its proper space, it's easy to find what you want to play with or use.
In a coherent space, everything is put into a specific order and pattern. It's like putting all the red blocks together, and all the blue blocks, and all the green blocks. It makes it easier to keep track of everything, and helps you find what you need quickly.
Scientists use the term "coherent" to describe how waves of light or sound move together in a very organized way. Imagine a group of children singing a song in perfect harmony. All the different voices are working together to create one beautiful sound. That's what happens when waves move together in a coherent way.
In space, there are lots of waves of energy and light moving around. When they are coherent, they work together to create organized patterns that can be very beautiful to look at. Sometimes these patterns can even be used for things like communication or navigation.
So, a coherent space is a big, empty area where everything is organized in a neat and tidy way. It's like a toy box or a group of singers working together to create something beautiful. When things in space are coherent, they work together in a very organized way to create patterns that can be useful for scientists and astronauts.