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April 2016: Picture of the Month

April 2016: Picture of the Month

SDP81_alma_9602

The foreground galaxy, (shown in blue) taken by the Hubble Space Telescope, acts as a gravitational lens. Surrounding it is the background galaxy, taken by the Atacama Large Millimeter Array, (shown in red). The alignment is so precise that the distant galaxy is distorted into a ring around the foreground galaxy; the ring formation known as an Einstein ring.

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