![Astronomers using ESO telescopes have discovered giant spots on the surface of extremely hot stars hidden in stellar clusters, called extreme horizontal branch stars. This image shows an artist’s impression of what one of these stars, and its giant whitish spot, might look like. The spot is bright, takes up a quarter of the star’s surface and is caused by magnetic fields. As the star rotates, the spot on its surface comes and goes, causing visible changes in brightness.](https://www.portalastronomico.com/wp-content/uploads/2020/08/estrellas-calientes-manchas-magneticas-863x521.jpg)
Utilizando telescopios del Observatorio Europeo Austral (ESO), un equipo de astrónomos ha descubierto manchas gigantes en la superficie de estrellas extremadamente calientes escondidas en cúmulos estelares. Estas estrellas no sólo están plagadas de manchas magnéticas, algunas también experimentan eventos de superllamaradas, explosiones de energía varios…