We have launched the new Spitzer website! Send feedback to outreach@ipac.caltech.edu. Find the old website at http://legacy.spitzer.caltech.edu.
Galactic Metropolis
Sig10 005

Credit: NASA/JPL-Caltech/Subaru/C. Papovich (Texas A&M Univ.)

Observation • May 11th, 2010 • sig10-005


A surprisingly large collections of galaxies (red dots) stands out at a remarkably large distance in this composite image combining infrared and visible-light observations. NASA's Spitzer Space Telescope contributed to the infrared component of the observations, while shorter-wavelength infrared and visible data are provided by Japan's Subaru telescope atop Mauna Kea, Hawaii.

Looking out to this distance, the cluster appears as it was 9.6 billion years ago, only about three billion years after the Big Bang. Astronomers were surprised to find such a "modern" cluster at an era when its peers tended to be much smaller, presumably taking billions of more years to collect enough galaxies to reach such a size.

Infrared light from Spitzer at wavelengths of 3.6 and 4.5 microns is displayed in red. Subaru observations of near infrared and visible light with wavelengths of 0.9 and 0.44 microns are rendered in green and blue, respectively. The purple overlay is a calculated measure of overall galaxy density and highlights the high concentration of galaxies in the distant cluster.

About the Object

ClG J02182-05102XMM-LSS 02182-05102
Galaxy > Grouping > Cluster
Cosmology > Morphology > Deep Field
9,600,000,000 Light Years

Color Mapping

Band Wavelength Telescope
Infrared 4.5 µm Spitzer IRAC
Infrared 3.6 µm Spitzer IRAC
Infrared 900 nm Subaru Suprime
Optical 440 nm Subaru Suprime


Position (J2000)
RA =2h 18m 20.4s
Dec = -5° 9' 53.4"
Field of View
11.1 x 8.1 arcminutes
North is up