"We might have finally found the cause of a mystery that's lasted over 40 years," said researcher Sandino Estrada-Dorado.

Using ESA's XMM-Newton satellite and NASA's Chandra spacecraft ... which was observed in X-rays by the Chandra and XMM-Newton telescopes during its optically low states, when the source exhibits ...

Using ESA's XMM-Newton satellite and NASA's Chandra X-ray observatory, astronomers have observed a young stellar object known as HL Tauri. Results of the observation campaign, presented Feb. 11 on ...

The space telescope, which NASA has spent years developing ... The space observatory shared a ride with the four small satellites that make up NASA’s PUNCH mission, which will study how ...