Fast Facts: Hubble Ultra Deep Field
|| Hubble Ultra Deep Field (HUDF)
|| The HUDF is the deepest visible-light
image of the universe ever observed by a telescope. The image shows about
10,000 galaxies, and is like a geologic core sample of the universe,
cutting across billions of light-years of space. Hubble took 800 exposures
in 400 orbits to build this image.
||The most distant galaxies
in the HUDF are seen as they were 13 billion years ago, when
the universe was only 5 percent of its present age. These
observations approach the time in the early universe when stars first
began to shine.
|| The HUDF is found in the constellation
Fornax, located in the Southern Hemisphere. This region of the sky is
so empty that only a handful of the stars within our Milky Way Galaxy
can be seen in the image.
| The distances of the galaxies in
the HUDF vary. The nearest, larger, brighter, well-defined spiral and
elliptical galaxies are about a billion light-years away. The farthest,
smallest, reddest galaxies, numbering about 100, are 13 billion light-years
away and may be among the most distant known.
|| The patch of sky is less than 2 percent of the area of the full Moon as seen from Earth. The HUDF measures only
one-seventeenth of a degree across, an angular size smaller than that of the
largest impact basin on the Moon.
About 10,000 galaxies, some as far as 13 billion light-years away, range over this tiny section of sky.