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Lost in Space: Half of All Stars Are Rogues Between Galaxies

  • In the study, astronomers investigated the extragalactic background light, the sum of all light emitted by stars in the universe throughout history. Prior research had detected fluctuations in this light that did not appear to come from any known galaxies.
  • This finding of bright, blue light unexpectedly reveals these fluctuations may come from something called “intrahalo light,” which is created by stars flung into intergalactic space during titanic collisions and mergers of galaxies. The researchers found that there was as much light from these intergalactic stars as there was from stars located in galaxies.
  • These stars could help solve mysteries regarding missing light and particles that theory had suggested should exist, scientists say.

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