Introduction to general relativity in a setting with comparatively strong gravitational fields. This has become possible thanks to precision observations of binary pulsars. In such a star system, two highly compact neutron stars orbit each other. At least one of them is a pulsar – an astronomical object that emits a tight beam of radiowaves. These beams strike the Earth at very regular intervals, similarly to the way that the rotating beam of a lighthouse means that an observer sees the lighthouse blink, and can be observed as a highly regular series of pulses. General relativity predicts specific deviations from the regularity of these
When the Shadows Beam When the Shadows Beam When the Shadows Beam is an EP released by Silverstein in 2002. Only limited copies were printed. The songs Red Light Pledge, Wish I Could Forget You, Bleeds No More, and Last Days of Summer were re-recorded and re-released on their debut album, When Broken Is Easily Fixed. The song Red Light Pledge also appeared on the compilation record, Punk Goes Acoustic 2. As was also done with their previous EP, Summer's Stellar Gaze, despite the fact that the EP was long out of print, it could still be purchased though the band's 2006 release, ,