Gaia has charted the cosmos since 2014, creating a vast encyclopedia of the positions and movements of celestial objects in our Milky Way and beyond. It is difficult to capture the breadth of ...

Astronomers have spotted flares and echos coming from the supermassive black hole at the heart of the Milky Way, Sagittarius A* (Sgr A*). These "cosmic fireworks" and X-ray echoes could help ...