---
title: "Scientists may explain Tabby’s Star’s unusual dimming with dust"
url: "https://usubjects.com/article/scientists-may-explain-tabbys-stars-unusual-dimming-with-dust-4056"
updated: "2026-10-09T16:09:54.593Z"
description: "Scientists may have explained the unusual, irregular dimming of Tabby’s Star, an object that previously prompted speculation about a possible alien megastructure. Current research favors a natural cause, such as obscuring dust or debris, rather than evidence of extraterrestrial technology; no supporting comments were provided."
sources: ["https://www.skyatnightmagazine.com/news/why-is-tabbys-star-so-weird"]
licence: "All rights reserved"
---

# Scientists may explain Tabby’s Star’s unusual dimming with dust

Published: 2026-10-08  
Source: [r/abovethenormnews](https://www.skyatnightmagazine.com/news/why-is-tabbys-star-so-weird)

### Overview

Scientists may be closing in on a natural explanation for the strange brightness changes of **Tabby’s Star**, also known as Boyajian’s Star or KIC 8462852. The object became famous after astronomers observed deep, irregular dips in its light—behavior that briefly prompted speculation that an advanced extraterrestrial civilization could be constructing a vast energy-collecting structure around it.

Current research instead points toward **obscuring dust or debris** as the more plausible explanation. The findings do not establish a single, definitive cause, but they strengthen the case for ordinary astrophysical processes rather than evidence of alien technology.

### An Unusual Stellar System

Tabby’s Star is an F-type star located in the constellation Cygnus. It is slightly larger than the Sun and forms part of a binary system with a red-dwarf companion. Its unusual behavior was identified in data collected by NASA’s Kepler space telescope and examined by citizen scientists participating in the Planet Hunters project.

The star’s brightness sometimes fell by as much as **20 percent**. That is an exceptionally large change: a Jupiter-sized planet crossing a star of this type would be expected to block only about 1 percent of its light. The dimming events were also irregular, lacking the repeating pattern normally associated with a planet passing in front of its host star on a stable orbit.

### Competing Explanations

The observations led to several proposed explanations, including an uneven ring or cloud of dust, a swarm of disintegrating comets, and the aftermath of a collision that destroyed a planet. More speculative proposals suggested that astronomers might be seeing a **Dyson swarm**—a collection of artificial structures designed to capture a star’s energy.

However, none of the early theories fully accounted for every aspect of the star’s changing light curve. Researchers have also noted that dust is expected to make a star appear dimmer in different ways at different wavelengths, making multi-wavelength observations especially important for distinguishing natural material from an opaque artificial structure.

### A Newly Identified Dimming Event

Cristina Madurga-Favieres, a physics PhD student at the University of Warwick in the United Kingdom, and colleagues reanalysed observations from NASA’s Transiting Exoplanet Survey Satellite, or TESS. Their review revealed a previously unnoticed event dated **3 September 2019**.

The newly identified dip was approximately 1 percent and lasted about 21 hours. Unlike the star’s deeper, irregular declines, this event was **roughly symmetrical**, a shape that could be consistent with a planet passing across the star’s disk. That possibility is intriguing, but a single transit is not enough to determine the object’s orbital period or confirm that a planet caused it.

### Natural Causes Remain Favored

The TESS result may help researchers test the competing explanations by adding another precisely timed observation to the star’s long and complex record. Even so, the available evidence does not point to an alien megastructure. Instead, the broader pattern is increasingly compatible with **dust, debris, or fragmented material** moving through the system and intermittently blocking the star’s light.

Further observations will be needed to determine whether the 2019 event repeats, whether it shows the wavelength-dependent signature expected from dust, and how it fits with the deeper dimmings recorded by Kepler. For now, Tabby’s Star remains unusual—but its mystery appears more likely to have a natural solution than an extraterrestrial one.

## Provenance

This USUBJECTS page is a summary or digest of the linked original source. Any accompanying generated visual is an illustrative reconstruction, not evidence.