--- your online source for astronomical & satellite images ---
Hubble Deep Field Image Unveils
Myriad Galaxies Back to the Beginning of Time
Hubble Deep Field
Description: Galaxy Field
Position (J2000): RA 12h 36m 49.50s Dec. +62° 12' 58.0"
Constellation: Ursa Major
Distance: 6,500 light-years (2,000 parsecs)
Exposure Date(s): December 18 - 28, 1995
Image Credit: NASA, R. Williams and The Hubble Deep Field Team (STScI)
Release Date: January 15, 1996
Click the image to buy a print
ABOUT THIS IMAGE:
Several hundred never before seen galaxies are visible in this "deepest-ever" view of the universe, called the Hubble Deep Field (HDF), made with NASA's Hubble Space Telescope. Besides the classical spiral and elliptical shaped galaxies, there is a bewildering variety of other galaxy shapes and colors that are important clues to understanding the evolution of the universe. Some of the galaxies may have formed less that one billion years after the Big Bang.
Representing a narrow "keyhole" view all the way to the visible horizon of the universe, the HDF image covers a speck of sky 1/30th the diameter of the full Moon which is about the width of a dime 75 feet away (about 25% of the entire HDF is shown here). This is so narrow, just a few foreground stars in our Milky Way galaxy are visible and are vastly outnumbered by the menagerie of far more distant galaxies, some nearly as faint as 30th magnitude, or nearly four billion times fainter than the limits of human vision. (The relatively bright object with diffraction spikes just left of center may be a 20th magnitude star.) Though the field is a very small sample of the heavens, it is considered representative of the typical distribution of galaxies in space, because the universe, statistically, looks largely the same in all directions. Gazing into this small field, Hubble uncovered a bewildering assortment of at least 1,500galaxies at various stages of evolution.
The image was assembled from many separate exposures (342 frames total were taken, 276 have been fully processed to date and used for this picture) with the Wide Field and Planetary Camera 2 (WFPC2), for ten consecutive days between December 18 to 28, 1995. This picture is from one of three wide-field CCD (Charged Coupled Device) detectors on the WFPC2.
This "true-color" view was assembled from separate images were taken in blue, red, and infrared light. By combining these separate images into a single color picture, astronomers will be able to infer - at least statistically - the distance, age, and composition of galaxies in the field. Bluer objects contain young stars and/or are relatively close, while redder objects contain older stellar populations and/or farther away.
material was presented to the 187th meeting of the American Astronomical
Society in San Antonio, Texas on January 15, 1996