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Contact: Tim Stephens
University of California - Santa Cruz

Blazar PKS 1424+240

Caption: This is an artist's concept of the Hubble Space Telescope viewing ultraviolet light from the jet of the active galactic nucleus of PKS 1424+240. Clouds of hydrogen gas along the line of sight absorb the light at known frequencies, allowing the redshift and distance of each cloud to be determined. The most distant gas cloud determines the minimum distance to PKS 1424+240. Data from the Fermi Gamma-ray Space Telescope, shown on the horizon at the left, were also used for this study.

Credit: Image composition by Nina McCurdy, component images courtesy of NASA

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