It is said that it takes a particle accelerator the size of a milky way to probe the planck length. But with the resources available in the universe and with other billions year A.D. civilizations out there existing. What if they had created one already. Is there any galaxy out there that look like a particle accelerator in Astronomy? Also what is the equivalent Tev to probe the planck scale. How many Hiroshima size atomic bombs for example in energy or is it just the energy of a train collision?