Ever wonder how far away those stars in the night sky are? 🤔 Our Sun’s nearest neighbor star is about 4 light-years away … our galaxy is over 100,000 light-years wide! But what does that even mean? Check out this Tumblr for a primer: https://nasa.tumblr.com/post/184153458369/how-big-is-our-galaxy-the-milky-way | NASA Universe

👉At the very center of the Milky Way galaxy lies a supermassive black hole called Sagittarius A* (pronounced “Sagittarius A-star”). It sits about 26,000 light-years from Earth in the direction of the constellation Sagittarius. 🔭 How Massive Is It? Sagittarius A* contains about four million times the mass of our Sun. Despite this enormous mass, its event horizon — the boundary beyond which nothing can escape — is only about 24 million kilometers across, which is still smaller than Mercury’s orb