XMM-Newton, also known as the High Throughput X-ray Spectroscopy Mission and the X-ray Multi-Mirror Mission, is an X-ray space observatory launched by the European Space Agency in December 1999 on an Ariane 5 rocket. From Wikipedia
The galaxy, located 40 million light-years away, features an active supermassive black hole and an unexpectedly brighter X-ray source from a smaller black hole.
