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First Stars: Redshift

Graphic comparing the spectrum of light emitted by the first stars (Population III stars) when they formed to the redshifted spectrum that we would observe today.

Since the first stars formed more than 13.4 billion years ago, their light has stretched with the expansion of space, becoming dimmer and redder over time. The James Webb Space Telescope is designed to detect the very dim light in the red and infrared part of the electromagnetic spectrum.

  • Release Date
    February 22, 2019
  • Credit
    Image: NASA, ESA, CSA, STScI

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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

Image Credit

NASA, ESA, CSA, STScI

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