Maintaining a force structure sufficient to engage in large-scale, high-intensity combined arms campaigns and the advanced or specialized assets required to assure access to critical domains is essential to deterrence of conflict, much less war waging.
"It's correlating the increasing intensity in different bands that provides really important clues about the structure of the source, " Prof Madejski - a co-investigator on the NuStar X-ray telescope, told BBC News.
And under International Civil Aviation Organisation regulations, any structure over 45 metres tall on a flight path or near an aerodrome must be fitted with a medium-intensity aircraft warning light.