Astronomers working with the NASA’s Chandra X-Ray Observatory and ESA’s XMM-Newton have developed a technique to watch quasars and track the expansion of the Universe. More at #365DaysOfAstro
Based on X-ray detections from the Neil Gehrels Swift Observatory, scientists used the Chandra X-ray Observatory and found rings called light echoes moving out from a black hole and its companion star, reflecting off the surrounding dust clouds.
Think about it: Hubble is down to one gyro, maybe two; Kepler is in safe mode; and today, the Chandra X-ray telescope went into safe mode; Spitzer has run out of coolant but still doing science – our fleet of space telescopes is getting older what are we replacing them with?