Earth and Space

Tabby’s star

Stories from Physics for 11-14 14-16 IOP RESOURCES

Unusual fluctuations in the luminosity of an F-type main sequence star, known as Tabby’s star (after the lead author of the initial study Tabetha Boyajian) have led to a flurry of speculation about their cause. The star’s brightness dips aperiodically by up to 20%, with the reductions lasting between 5 and 80 days. The Penn State University astronomer Jason Wright proposed that the fluctuations could be explained by an alien ‘megastructure’ and added: “Aliens should always be the very last hypothesis you consider, but this looked like something you would expect an alien civilization to build.” Other astrophysics have since concluded that the most likely explanation for the fluctuations is that the star is surrounded by a swarm of comets or fragments of bodies too small to become planets. The orbiting objects absorb radiation, explaining the changes to luminosity.


Limit Less Campaign

Support our manifesto for change

The IOP wants to support young people to fulfil their potential by doing physics. Please sign the manifesto today so that we can show our politicians there is widespread support for improving equity and inclusion across the education sector.

Sign today