Radio-quiet neutron star ten bodies have been proposed as rotation-powered neutron stars that are not visible as radio sources, but are visible as x–ray and gamma ray sources. Indicators that they are indeed neutron stars include them having a high x-ray to lower frequencies emission ratio, a constant x-ray emission profile, and coincidence with a gamma ray source. Quark stars, theoretical neutron star-like objects composed of quark matter, may be radio quiet, according to some theories. More plausibly, however, radio-quiet neutron stars may simply be pulsars which do not pulse in our direction. As pulsars spin, it is theorized they emit radiation from
Racing the Beam speed electron beam across the screen. "Racing the Beam" discusses the history of the VCS platform and the design decisions that impacted the types of games that could be written for it. Specific titles such as "Combat", "Pitfall!" and "Yars' Revenge" are analyzed from a technical and cultural perspective. "Racing the Beam" is the first in a series of books on early video game platforms, and has been cited by modern Atari 2600 enthusiasts as an inspiration for attempting to write new games for the platform. Racing the Beam Racing the Beam: The Atari Video Computer System is a book