Link: IIPMooViewer 2.0 :: IIPImage High Resolution HTML5 Ajax Image Streaming Viewer: A Billion Stars

The full image contains 150 billion pixels, and the detail it contains is only revealed by the three zoom levels, which are centred on G305, a large and complex star-formation region. The innermost zoom covers a tiny fraction of the full image, but still contains more than ten thousand stars.
The picture doesn't look that promising at minimum zoom but zoom in a little and more detail will be revealed.

The bar at the top right of the screen contains a box that adjusts in size according to your current level of zoom against the full image. The box moves to follow your current zoomed view against the full image.