Images: NASA, ESA, S. Beckwith (STScI) and the
In the full Hubble Ultra Deep Field (above), Hubble uncovered
10,000 galaxies, most of which existed before Earth was born. The
light from these distant galaxies must travel for a long time before
arriving at Earth. It takes billions of years for that light to
arrive, so we are seeing the galaxies as they appeared when the
light left them billions of years ago, long before the Sun and
Earth were born.
The area within the
white square, above, is shown enlarged, below. The bright orange
object with a distinctive cross shape, below, is a star, not a
galaxy. The cross shape occurs whenever a star's very bright light
passes through the telescope.