the most important image captured by Hubble

In 1996, scientists took a huge risk when they pointed the Hubble telescope to an inky field that they believed to be void of stars and planets. As images from Hubble are in constant demand, the worry was that devoting so much time to a black space would prove futile. Once the photons finally registered, though, that leap of faith proved fruitful: light from over three thousand galaxies illuminated the image. A few years and missions later, Hubble's glimpse into what is known as the deep field has revealed that we are just one tiny part of a vast system comprising 100 billion galaxies.
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