Four probable detections of gravitational waves have so far been reported, each associated with the merger of two black holes. Analysis of the signals allows formation theories of such black-hole systems to be tested. See Letter p.426

Brightness of exploding stars may vary more than researchers realized.

Rather than being caused by extraterrestrial construction, the bizarre dimming of Tabby’s star could instead be due to a closely orbiting, ringed planet

Portal origin URL: Hinode Satellite Captures Powerful Aug. 21 Eclipse Images, Video Portal origin nid: 408183Published: Wednesday, August 23, 2017 - 11:37Featured (stick to top of list): noPortal text teaser: As Americans across the nation watched the total solar eclipse Aug. 21, the international Hinode solar observation satellite, flying some 422 miles above the Pacific Ocean, caught its own unique angle on the natural phenomenon.Portal image: A second image from Hinode of the Aug. 21 total solar eclipse, taken approximately 5 minutes farther into lunar transit. Science Categories: Sun

Using ESO’s Very Large Telescope Interferometer astronomers have constructed the most detailed image ever of a star — the red supergiant star Antares. They have also made the first map of the velocities of material in the atmosphere of a star other than the Sun, revealing unexpected turbulence in Antares’s huge extended atmosphere. The results were published in the journal Nature.

Find out when you can next witness a solar eclipse in your country with our eclipse calculator.

Leah Crane joined solar researchers to watch yesterday’s eclipse, a rare chance to look at a scorching ring of space around the sun that we can almost never see

Proposals are solicited for observations with XMM-Newton in response to the seventeenth Announcement of Opportunity, AO-17, issued 22 August 2017. This AO covers the period May 2018 to April 2019 and is open to proposers from all over the world.