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An unlucky star is torn apart by the strong gravity of a black hole, leading to the launching of a relativistic jet. Carl Knox – OzGrav, ARC Centre of Excellence for Gravitational Wave Discovery, Swinburne University of Technology

Astronomers witness the dying flare of a star torn apart by a black hole halfway across the Universe

When a black hole tears apart a star, it feeds on the debris and launches a powerful jet.
An artist’s impression of the Earth around 2.7 billion years ago in the Archean Eon. With green iron-rich seas, an orange methane-rich atmosphere and a surface dominated by oceans, the Archean Earth would have been a very different place. (Illustration by Andrey Atuchin)

Where did the Earth’s oxygen come from? New study hints at an unexpected source

Could tectonic processes in the early Earth have contributed to the rise of oxygen?