By 2006, the X-ray intensity of this knot had increased by a factor of 50 over a four-year period.

X-ray pulsars or accretion-powered pulsars are a class of astronomical objects that are X-ray sources displaying strict periodic variations in X-ray intensity.

Because the X-ray intensity follows an inverse-square law, the tolerances for this placement and for the flatness of the surface must be very tight in order to maintain a repeatable X-ray flux.

The X-ray intensity from Aladdin was much higher than on Tantalus, especially in the photon energy range up to 4000eV.

The X-ray intensity is strongest in the region of intersection between the lattice rods (grey bars) and superlattice rods (black lines).

This would be reasonable if the gas were highly clumped as the X-ray intensity per unit mass would then increase.

Extended Uhuru observations of Cygnus X-1 showed fluctuations in the X-ray intensity that occurs several times a second.

The little ship had advanced to within twenty millions of miles of the blue-white sun, and even at that distance there was a detectable X-ray intensity.

In the Röntgensatellit (ROSAT) image of the Moon, pixel brightness corresponds to X-ray intensity.

The X-ray intensity around the capsule must be very symmetrical to avoid hydrodynamic instabilities during compression.