This Hubble image contains thousands of galaxies. But it also contains some cosmic photobombers!
The streaks you see here are actually the trails of asteroids.
They appear curved due to something called parallax; as Hubble orbits around Earth, an asteroid will look like it moves along an arc in comparison to much more distant background stars and galaxies. This effect is kind of like what you see from a moving car, when trees by the side of the road appear to be passing by faster than background objects that are faraway.
Image Credits: NASA, ESA, and B. Sunnquist and J. Mack (STScI)
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