Galactic gravitational lensing, Atacama Large Millimeter Array (ALMA) image. The orange ring is millimetre wavelength light from the galaxy SDP.81 (12 billion light years distant), gravitationally lensed around a closer galaxy (not seen, 4 billion light years distant). The millimetre wavelength light is emitted by dust (bright orange ring) and carbon monoxide (CO, fainter orange areas) in the distant galaxy. This galaxy is in the constellation of Hydra. The observations were made in 2014.