Geminga

Geminga is a pulsar in the constellation Gemini. The distance is about 800 light-years, however, is subject to great uncertainty.

The name is derived from Gemini gamma-ray source (Gemini gamma-ray source). Discovered in 1972 with the help of the satellite SAS -2, Geminga is the second brightest known source of gamma radiation above 100 MeV energy. In 1992, the ROSAT satellite detected a periodicity of the radiation of 0.237 seconds, which Geminga is a pulsar. In contrast to other known pulsars Geminga, however, does not emit in the radio range. He is the erdnächste known pulsar.

Geminga was formed about 300,000 years ago in a supernova explosion. This explosion is, according to some theories, the cause of the relatively low density of interstellar material in the vicinity of the solar system. This phenomenon is referred to as local bladder.