Albert Einstein predicted that the gravity of massive objects could actually bend light, creating an optical illusion. Hubble's newly updated Advanced Camera for Surveys (ACS) captured a dramatic example of this phenomenon, known as "gravitational lensing."
In a set of four photographs released September 9, 2009, the massive galaxy cluster Abell 370 bends the light of galaxies behind it, creating funhouse mirror-like reflections in space.
One such effect, the "Dragon" (top left), is actually several reflections of a background galaxy overlapping one another, Hubble science oversight chair Bob O'Conner explained.
Image courtesy NASA, ESA, and the Hubble SM4 ERO Team