Sagittarius B2 is a really big and massive cloud of gas and dust. It's located in the center of our Milky Way galaxy, which is like our home in space. Think of it like a big playground with lots of toys to play with, but Sagittarius B2 is like the biggest toy in the playground.
This cloud is made of many different things, like water, carbon monoxide, and other molecules that are too small for us to see. Sometimes, scientists call Sagittarius B2 a "molecular cloud" because it's made of lots of different molecules.
Scientists study Sagittarius B2 to learn more about how stars and planets form in our galaxy. It's like they're doing a science experiment, but instead of using a microscope or test tubes, they're using big telescopes to look at the cloud and see what's inside.
Sagittarius B2 is really far away from us, so scientists can't just go there and study it in person. Instead, they use special tools and instruments to look at it from afar. This helps them learn a lot about the cloud and how it works, even though they can't touch it or play with it like a toy.
Overall, Sagittarius B2 is a big and important thing in space that scientists study to learn more about how our galaxy works. It's like a puzzle piece that helps them put together the bigger picture of what's happening in space.