CG 4 is a big, bright cloud of gas and dust in outer space. Think of it like a big, fluffy cotton cloud you might see in the sky. But instead of being made of water droplets, CG 4 is made of gas and dust particles that are spread out in space.
CG 4 is special because it's what scientists call a "reflection nebula." This means that it doesn't produce its own light like stars do, but instead reflects the light of nearby stars. Imagine standing in front of a mirror and someone shining a flashlight at you - the mirror reflects the light and you can see the beam. CG 4 is like the mirror, reflecting the light of nearby stars and making the gas and dust glow.
Scientists are very interested in CG 4 because of the way it's shaped. It looks like a big, curved "S" in space. They think that this shape is caused by something called a "stellar wind," which is kind of like a big gust of air coming from a star. The wind blows the gas and dust particles around, creating the unique shape that CG 4 has.
In summary, CG 4 is a big cloud of gas and dust in space that reflects the light of nearby stars. Its unique "S" shape is thought to be caused by a stellar wind blowing the particles around.