When doctors use the term tumor they are talking generically and not about the size of the lesion. A mass usually refers to a lump which is at least 20 mm (0.787 inches) in diameter at its widest point, while a nodule is less than 20 mm at its widest point.
But how big a spiral can you get? Our Milky Way galaxy is pretty beefy, one of the bigger spiral galaxies in the Universe. Itâs roughly 100,000 light-years across, or a quintillion kilometers. Thatâs a lot of kilometers. Donât go bragging to your friends just yet though.
The Galactic Center is the term used to denote the center of the Milky Way galaxy. Although it is not proven, there is much speculation of a supermassive black hole at the center of our galaxy. The Galactic center is estimated to be between 7.6 and 8.7 kiloparsecs away, or 25,000 to 28,000 light years. Interestingly, the earth is about the same distance away from the edge of the Milky Way as it is to the center.