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takyon writes:

Tabby's star, aka KIC 8462852, is likely surrounded by orbiting dust grains that block ultraviolet light:

The bizarre long-term dimming of Tabby's star—also known as Boyajian's star, or, more formally, KIC 8462852—is likely caused by dust, not a giant network of solar panels or any other "megastructure" built by advanced aliens, a new study suggests.

Astronomers came to this conclusion after noticing that this dimming was more pronounced in ultraviolet (UV) than infrared light. Any object bigger than a dust grain would cause uniform dimming across all wavelengths, study team members said.

"This pretty much rules out the alien megastructure theory, as that could not explain the wavelength-dependent dimming," lead author Huan Meng of the University of Arizona said in a statement. "We suspect, instead, there is a cloud of dust orbiting the star with a roughly 700-day orbital period."

Aliens left to roam free once again.

Previously: Tabby's Star Under Observation After Dimming Event Detected
Tabby's Star Dimming Could be Explained by a Saturn-Like Exoplanet

Extinction and the Dimming of KIC 8462852 (DOI: 10.3847/1538-4357/aa899c) (DX) (arXiv)

Original Submission