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"Dust is most likely the reason why the star's light appears to dim and brighten," said lead author Tabetha Boyajian, assistant professor of physics and astronomy at Louisiana State University, for whom "Tabby's Star" is nicknamed.

"Enhancing biosecurity is also of paramount importance and requires a lot of education and training for farmers to understand the concept and apply good management practices on their farm."

"Each operator paid nearly 500,000 yuan (,400) to the group every year," said one business operator surnamed Liu. "The group had been trying to take back the venues since May 2018, but failed to reach an agreement with some of the operators."

"Everybody can challenge an extradition request on the basis it would be contrary to their human rights for them to be extradited," Vamos said.

"Failure is, usually, inevitable in overseas cooperation because of language and culture differences," said Co De Heus, CEO of Royal De Heus, the company's third-largest shareholder.