Actually, the group of bananas commonly referred to as a bunch at the store is actually a hand, or less commonly tier.
PSR B1509-58 - X-rays from Chandra are gold; Infrared from WISE in red, green and blue/max. A pulsar (from pulse and -ar as in quasar) is a highly magnetized, rotating neutron star or white dwarf, that emits a beam of electromagnetic radiation. This radiation can be observed only when the beam of emission is pointing toward Earth (much like the way a lighthouse can be seen only when the light is pointed in the direction of an observer), and is responsible for the pulsed appearance of emission.
A pulse is a wave packet containing broad range of frequencies. A pulse (wave packet) is a localized disturbance that results from the sum of many different wave forms. The wave is the transport of disturbances in space, not associated with motion of the medium occupying this space as a whole.s there is but one pulse, the wave travels through water at velocity v and that one wave's energy compresses and releases water as the wave travels through the water.