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.
Not a black hole, for a change, but a vaster expanse of darkness. On the largest scales explored, galaxies are arranged into great walls and knots as much as a few hundred million light years across, with voids in between. The biggest known void â freakishly large at around a billion light years â was found in 2007.