This image shows the region of sky around the massive galaxy cluster Abell 2218, as seen by Herschel and Hubble. On the left, the images at the three SPIRE wavelength bands are shown, while the center image is a false-color composite. The center of the galaxy cluster is shown as a white cross-hair, while the large yellow blob just below it is a more distant galaxy. The light from this distant galaxy is being bent and magnified by the immense mass of the Abell 2218 cluster, allowing astronomers to see it in more detail than would otherwise be possible without this chance alignment. It is seen as it was around 2.6 billion years after the Big Bang. The other structures in the image are largely due to closer, fainter galaxies which are observed by optical observatories such as the Hubble Space Telescope, as shown on the right.
ESA/SPIRE and HerMES Consortia (left); ESA/NASA/STScI (right)