At 6,637 by 3,787 pixels, this Hubble Telescope composite of galaxy NGC1300 is one of the largest ever created. Below I have inserted a smaller version but clicking on this link will take you to the original which shows incredible detail.

The Astronomy Picture of the Day caption:

Barred Spiral Galaxy NGC 1300 
Image Credit: Hubble Heritage Team, ESA, NASAExplanation: Big, beautiful, barred spiral galaxy NGC 1300 lies some 70 million light-years away on the banks of the constellation Eridanus. This Hubble Space Telescope composite view of the gorgeous island universe is one of the largest Hubble images ever made of a complete galaxy. NGC 1300 spans over 100,000 light-years and the Hubble image reveals striking details of the galaxy’s dominant central bar and majestic spiral arms. In fact, on close inspection the nucleus of this classic barred spiral itself shows a remarkable region of spiral structure about 3,000 light-years across. Like other spiral galaxies, including our own Milky Way, NGC 1300 is thought to have a supermassive central black hole.