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A massive black hole at the heart of a galaxy in the Virgo constellation is waking up, shooting out intense X-ray flares at regular intervals that have puzzled scientists, a study said Friday.

Europe's Gaia space telescope was powered down and sent into "retirement" on Thursday after a decade revealing the secrets of the Milky Way, but its observations will fuel discoveries for decades to come.

Oxygen has been detected in the most distant galaxy ever discovered, surprised astronomers said Thursday, offering further evidence that stars in the early universe matured far quicker than had been thought possible.

Scientists say a supernova explosion close to Earth could be to blame for two extinction events.

Researchers believe they've found evidence that a white dwarf may have torn a Jupiter-sized planet apart.

The discovery means habitable planets could have started forming much earlier.

Also called molecular clouds, they can be massive, spanning hundreds of light-years and forming thousands of stars.

Scientists say the "promising" super-Earth may house water.