MACS J0717 Parallel Field (Frontier Fields)

A swirling spiral galaxy and bright foreground star (center) dominate a deep field of galaxies in this image of a piece of sky near galaxy cluster MACS J0717.5+3745 (not shown.) This parallel field was captured as part of Hubble's Frontier Fields project, which used the combined power of natural "gravitational lenses" caused by massive galaxy clusters and Hubble's ability to create long-exposure deep field images to see galaxies that would normally be far beyond the reach of telescopes.