What is the centre of the milky way and is it a threat?

When you look at a picture of our milky way some of you may think to your selves. What is that very bright light in the middle of our milky way and why is our milky way in a spiral motion.

Well its because there is super massive black hole Called Sagittarius A*. most of us know that black holes spin around in a circle motion that is why our milky way is in a spiral Shape.Black holes have a very strong gravitation pull witch pulls all the stars into the back hole this is why it is so bright.Your probably wandering why we cant see the blinding light also is that black hole a threat to us.Well its not a threat to us don't worry we are 28,000 light years away from the center of the milky way. Also we can see the arm of the milky way sometime but rarely.The reason we cant see the center of the milky way is because there is a mass amount of stars,dust and other materials that are light years wide.