When the Hubble Space Telescope looks at the deep and distant universe, sometimes nearby asteroids get in the way.
This Hubble photo of a random patch of sky is part of a survey called Frontier Fields. The colorful image contains thousands of galaxies, including massive yellowish ellipticals and majestic blue spirals. Much smaller, fragmentary blue galaxies are sprinkled throughout the field. The reddest objects are most likely the farthest galaxies, whose light has been stretched into the red part of the spectrum by the expansion of space.
The asteroids tracing out curved paths are, on average, a mere 250 million km away.