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Geminga is a very weak neutron star and the pulsar next to us, which almost only emits extremely hard gamma-rays, but no radio waves. Why this is so is unknown. It has a period of 4.2 revolutions per second.

The supernova explosion 300 000 years ago, which left behind Geminga, could be responsible for the existence of the Local Bubble. Some thousand years ago our Sun entered this several hundred light-years big area, which is nearly dust-free.

Constellation: Gemini
Age: 300 000 years
Distance: 552 light-years
Visual magnitude: 25.5

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The arrow points to the direction in which Geminga moves.
Photo: Image courtesy of P.A. Caraveo (INAF/IASF), Milan and ESA.

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