Hubble Space Telescope Sees Einstein Ring.
A keen eye can spot exquisite elliptical and spiral galaxies, seen at various orientations: edge-on with the plane of the galaxy visible, face-on to show off magnificent spiral arms, and everything in between.
The vast majority of these specks are galaxies, but to spot a foreground star from our Milky Way Galaxy, you can look for a point of light with tell-tale diffraction spikes.
The most alluring subject sits at the center of the frame.
With the charming name of SDSS J0146-0929, the glowing central bulge is a galaxy cluster — a huge collection of hundreds of galaxies all shackled together in the unyielding grip of gravity.
The mass of this galaxy cluster is large enough to severely distort the spacetime around it, creating the odd, looping curves that almost encircle the cluster.
These graceful arcs are examples of a cosmic phenomenon known as an Einstein ring (also known as an Einstein-Chwolson ring or Chwolson ring).
The ring is created as the light from a distant objects, like galaxies, pass by an extremely large mass, like this galaxy cluster.
In this image, the light from a background galaxy is diverted and distorted around the massive intervening cluster and forced to travel along many different light paths towards Earth, making it seem as though the galaxy is in several places at once.