Russian cosmonauts Alexey Ovchinin and Ivan Vagner installed an X-ray detector and jettisoned trash during a spacewalk ...

The wide-field X-ray telescope on the EP satellite detected over 6,800 X-ray sources distributed across the celestial sphere (under Galactic coordinates). [Photo provided to chinadaily.com.cn] The ...

Ah, there it is. The first-magnitude star shining faintly on the dull celestial sphere must be Vega (Orihime in the Tanabata legend) in the Lyra constellation. I had given up on seeing it from the ...