While the pattern of sources across the sky may appear random, some structure can be seen here. The oval represents the celestial sphere, an abstract perspective upon which our observations of the Universe are projected. The data are plotted in galactic coordinates, such that the centre of the plot corresponds to the centre of our Milky Way galaxy – and this can be seen in the image. Through the centre of the oval is a horizontal line, where patches of purple appear to draw together. This line is the plane of the Milky Way galaxy, with the large splotch of colour in the centre corresponding to our galaxy’s core, where XMM-Newton made a higher number of serendipitous detections.