News Release Archive:

News Release 420 of 1051

March 6, 2007 01:00 PM (EST)

News Release Number: STScI-2007-06

Hubble Pans Across Heavens to Harvest 50,000 Evolving Galaxies


Image: A Sky Flush with Galaxies

A Sky Flush with GalaxiesSTScI-PRC2007-06b

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This image, taken by NASA's Hubble Space Telescope, represents a small section of a larger panoramic view of the heavens, where at least 50,000 galaxies reside.

The cosmic tapestry unveils galaxies in all shapes, sizes, and colors. Some of the galaxies are nearby; the smaller ones are far away and existed when the universe was only a small fraction of its current age of roughly 14 billion years.

The Hubble observation, made with the Advanced Camera for Surveys, is part of the All-wavelength Extended Groth Strip International Survey, a collaborative effort using major ground-based and space-based telescopes to focus on a narrow swath of sky near the Big Dipper. The region offers a clear view of the distant universe.

Astronomers studying the Groth Strip find that star formation is largely driven by the supply of raw materials, such as gas and dust, collapsing under the force of gravity. More massive galaxies form stars early, whereas the smaller galaxies create their stars over longer timescales. Both normal-looking, undisturbed galaxies and those showing signs of catastrophic collisions were forming an abundance of stars 8 billion years ago. This evidence suggests that violent galaxy mergers were not required for rapid star formation.

The Groth Strip is an extension of an original survey of part of the same region executed in 1994 by Princeton University astronomer Edward J. Groth, who created a mosaic of 28 overlapping fields with the Hubble Wide Field Planetary Camera 2.

The Advanced Camera for Surveys image was taken from June 2004 to March 2005.

Object Name: Extended Groth Strip (EGS)

Image Type: Astronomical/Annotated

Credit: NASA, ESA, M. Davis (University of California, Berkeley), S. Faber (University of California, Santa Cruz), and A. Koekemoer (STScI)


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