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The COSMOS-Webb Field Compared with the Hubble ACS Field

Comparison between the COSMOS field of view from Hubble's ACS and the COSMOS field of view from Webb. In the bottom left corner is an image of the Moon for scale.

The COSMOS-Webb survey will map 0.6 square degrees of the sky—about the area of three full Moons—using the James Webb Space Telescope’s Near Infrared Camera (NIRCam) instrument, while simultaneously mapping a smaller 0.2 square degrees with the Mid Infrared Instrument (MIRI). The jagged edges of the Hubble field’s outline are due to the separate images that make up the survey field.

  • Release Date
    August 18, 2021
  • Science Release
    Mapping the Universe’s Earliest Structures with COSMOS-Webb
    Read the release
  • Credit
    NASA, ESA, Jeyhan Kartaltepe (RIT), Caitlin Casey (UT Austin), Anton Koekemoer (STScI)

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A white square with irregular, jagged edges falls just within the dimensions of the image. Within it is a grayscale field that shows hundreds of bright white points in a range of sizes.

The COSMOS Hubble ACS Field

This sea of galaxies is the complete, original COSMOS field from the Hubble Space Telescope’s Advanced Camera for Surveys (ACS). The full mosaic is a composite of 575 separate ACS images, where each ACS image is about one-tenth the diameter of the full Moon. The jagged edges of...

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Last Updated
Aug 28, 2025
Contact
Media

Laura Betz
NASA’s Goddard Space Flight Center
Greenbelt, Maryland
laura.e.betz@nasa.gov

Science Credit

NASA, ESA, Jeyhan Kartaltepe (RIT), Caitlin Casey (UT Austin), Anton Koekemoer (STScI)

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