Left: Images for three of the UDGs, highlighting the apertures used in orange. Right panels: Metallicity gradients for each individual galaxy, compared with simulated ultra-diffuse galaxies (top). Age gradients vs. metallicity for the dwarf galaxies in this work and observations/simulations of traditional dwarf galaxies (bottom). These two panels show how the gradients of these low surface brightness dwarf galaxies are virtually flat in both age and metallicity, indicating that each galaxy formed its entire structure at similar times, as in "Everywhere, Everything, All at Once."