Asteroid Photobomb! Space Rocks Invade Hubble Galaxy View
"This parallax effect is somewhat similar to the effect you see from a moving car, in which trees by the side of the road appear to be passing by much more rapidly than background objects at much larger distances," STScI officials explained in the same statement. "The motion of Earth around the sun, and the motion of the asteroids along their orbits, are other contributing factors to the apparent skewing of asteroid paths."
Each asteroid was found manually by "blinking" images (quickly moving between different images of the same field of view) to look for asteroid motion. The arcs of the asteroid motions are distinct from separate arcs of blue light, which represent distorted images of galaxies that are behind the cluster. (The light from these galaxies is bent by dark matter, scientists said.)
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