“There's clearly an anomaly. Now we need to try to understand it and explain it.”
Then they used large archives of galaxy observations, like those from the Hubble Space Telescope, to calculate the light emitted by all the galaxies in the universe. The measured COB is roughly twice as bright as that calculation. , this new measurement reveals a wider difference, and with smaller uncertainty. “There’s clearly an anomaly. Now we need to try to understand it and explain it,” says coauthor Marc Postman, an astronomer at the Space Telescope Science Institute in Baltimore, Md.
There are several astronomical reasons that could explain the discrepancy. Perhaps, says Postman, rogue stars stripped from galaxies linger in intergalactic space. Or maybe, he says, there is “a very faint population of very compact galaxies that are just below the detection limits of Hubble.” If it’s the latter case, astronomers should know in the next couple years because NASA’s recently launchedAnother possibility is the researchers missed something in their analysis.
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