Five previously unknown asteroids in our solar system have photobombed new Hubble Space Telescope images. Astronomers spotted the space rocks—plus another two that had been previously cataloged—in images collected as part of the Frontier Fields project, which observed six clusters of galaxies billions of light-years away. When multiple exposures obtained at different times were stacked together to produce the image above, the asteroids showed up as trails because they had moved between exposures, and some of the asteroids were spotted more than once. The five new asteroids orbit within the asteroid belt between Mars and Jupiter. Previous studies missed them because they’re extremely faint.