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.
Understanding sizes and distances in the Universe: scale model of solar system, galaxy, distances to galaxies, size of Universe. On a 1-to-10 billion scale, the sun is the size of a grapefruit, Earth is a ball point about 15 meters away, and the nearest stars are thousands of kilometers away. Our galaxy has so many stars that it would take them thousands of years just to count them. -If our galaxy was the size a football field, Earth would be a microscopic dot on the 20-yard line. -Every grain of sand on every beach on Earth added together equals the amount of stars in the observable universe.