The mysterious dimming of Tabby’s Star was not caused by aliens
In short: For years, astronomers puzzled over KIC 8462852, a star whose brightness fluctuated with bizarre, irregular dips. While the media speculated about massive, energy-collecting alien megastructures, new observations suggest a far more natural, albeit still mysterious, cosmic culprit is at work.
The star, nicknamed "Tabby’s Star" after astronomer Tabethapo Boyajian, sits approximately 1,500 light-years from Earth. It is larger and hotter than our sun, but its behavior is anything but ordinary. Since 2015, researchers have documented dramatic brightness variations, including a single event where the star's luminosity dropped by as much as 22 percent. These irregular dips, which did not follow the predictable patterns of orbiting planets, initially fueled wild hypotheses ranging from black holes to swarms of shattered comets.
The most spectacular theory—that the dips were caused by an orbiting alien megastructure designed to harvest energy—captured global attention. This speculation was bolstered by the star's irregular light curves, which appeared far more intense than typical planetary transits. However, intensive observations conducted between March 2016 and December 2017 using the Las Cumbres Observatory robotic telescope network provided the evidence needed to pivot away from extraterrestrial life.
By analyzing light at different wavelengths, Jason Wright and Tabetha Boyajian's team discovered that the dimming was not uniform. Specifically, more blue light was blocked than red light. This variable dimming indicates that the obscuring material is not an opaque, solid object like a planet or a manufactured structure, but rather something diffuse. The current leading explanation is a cloud of dust—perhaps the debris from a destroyed moon or planet—that may complete an orbit every 700 Earth days. While the "alien" theory has been dismissed, the origin of this dust remains a compelling mystery for astronomers.
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Sources
- Summary by Intellect · source: KIC 8462852 Looks Strange, But Is It A Sign Of Aliens?
- Also: Dust, Not an Alien Megastructure, Likely Causes Strange Winks in Tabby’s Star Brightness
- Also: No Alien Megastructure: Star
- Also: www.nationalgeographic.com — Mystery of 'Alien Megastructure' Star Has Been Cracked
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