https://www.nasa.gov/universe/nasas-fermi-mission-links-nearby-pulsars-gamma-ray-halo-to-antimatter-puzzle/
Geminga (pronounced geh-MING-ga), discovered in 1972 by NASA's Small Astronomy Satellite 2, is among the brightest pulsars in gamma rays. It is located about 800 light-years away in the constellation Gemini. Geminga's name is both a play on the phrase "Gemini gamma-ray source" and the expression "it's not there" — referring to

https://www.sciencealert.com/a-bright-pulsar-star-with-a-strange-halo-could-explain-the-puzzling-antimatter-on-earth-s-doorstep
The pulsar is named Geminga, and it's one of the nearest pulsars to Earth, about 800 light-years away in the constellation Gemini. Not only is it close to Earth, but Geminga is also very bright in gamma rays. The halo itself is invisible to our eyes, obviously, since it's in the gamma wavelengths. ( NASA's Fermi Gamma-ray Space Telescope

https://scitechdaily.com/long-standing-antimatter-mystery-may-be-solved-by-discovery-of-nearby-pulsars-gamma-ray-halo/
NASA 's Fermi Gamma-ray Space Telescope has discovered a faint but sprawling glow of high-energy light around a nearby pulsar. If visible to the human eye, this gamma-ray "halo" would appear about 40 times bigger in the sky than a full Moon. This structure may provide the solution to a long-standing mystery about the amount of antimatter

https://www.youtube.com/watch?v=A6Ng7mlY6Ws
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https://phys.org/news/2019-12-fermi-mission-links-nearby-pulsar.pdf
NASA's Fermi Gamma-ray Space Telescope has discovered a faint but sprawling glow of high-energy light around a nearby pulsar. If visible to the human eye, this gamma-ray "halo" would appear about

https://www.sciencedaily.com/releases/2019/12/191219125956.htm
Geminga (pronounced geh-MING-ga), discovered in 1972 by NASA's Small Astronomy Satellite 2, is among the brightest pulsars in gamma rays. It is located about 800 light-years away in the

https://gms.gsfc.nasa.gov/cgi-bin/details.cgi?aid=13209&button=recent
A new study of observations from NASA's Fermi Gamma-ray Space Telescope has discovered a faint but sprawling glow around a nearby pulsar. If visible to the human eye, this gamma-ray "halo" would appear larger in the sky than the famed Big Dipper star pattern. This structure may provide the solution to a long-standing mystery about the amount of antimatter in our neighborhood.

https://svs.gsfc.nasa.gov/13209
A new study of observations from NASA's Fermi Gamma-ray Space Telescope has discovered a faint but sprawling glow around a nearby pulsar. If visible to the human eye, this gamma-ray "halo" would appear larger in the sky than the famed Big Dipper star pattern. This structure may provide the solution to a long-standing mystery about the

https://phys.org/news/2019-12-fermi-mission-links-nearby-pulsar.html
Geminga (pronounced geh-MING-ga), discovered in 1972 by NASA's Small Astronomy Satellite 2, is among the brightest pulsars in gamma rays. It is located about 800 light-years away in the

https://astronomynow.com/2019/12/31/nearby-pulsar-a-likely-source-of-high-energy-antimatter-cosmic-rays/
Nearby pulsar a likely source of high-energy antimatter cosmic rays. Geminga is the name given to a pulsar 800 light years away that spins on its axis every 4.2 seconds. It is one of the brightest sources of pulsar-generated gamma rays, sporting a faint but vast halo that, if visible to human eyes, would appear 40 times larger than the full moon.

https://www.nasa.gov/image-article/chandra-images-show-that-geometry-solves-pulsar-puzzle/
This four-panel graphic shows the two pulsars observed by Chandra. Geminga is in the upper left and B0355+54 is in the upper right. In both of these images, Chandra's X-rays, colored blue and purple, are combined with infrared data from NASA's Spitzer Space Telescope that shows stars in the field of view. Below each data image, an artist

https://www.nature.com/articles/s41550-021-01580-0
In the case of Geminga, ref. 55 examined a 1° region around the pulsar and obtained an upper limit on the magnetic field below 1 μG, based on X-ray upper limits on the synchrotron emission by

https://medium.com/starts-with-a-bang/pulsars-not-dark-matter-explain-the-milky-ways-antimatter-9e229411968e
The measurement of the gamma rays arising from Geminga, alone, suggests that this one pulsar could be responsible for as much as 20% of the high-energy positrons that were seen by the AMS-02

https://medium.com/the-cosmic-companion/halo-around-pulsar-could-answer-mystery-of-anti-matter-2d68fa0e1fef
Larger than the Big Dipper as seen from Earth, a faint halo surrounding an energetic dead star could answer one of the great mysteries of cosmic rays and help reveal the behavior of pulsars. The

https://www.forbes.com/sites/startswithabang/2019/12/26/antimatter-mystery-likely-due-to-pulsars-not-dark-matter/
The measurement of the gamma rays from Geminga alone suggests that this one pulsar could be responsible for as much as 20% of the high-energy positrons seen by the AMS-02 experiment.

https://www.universetoday.com/144453/halo-around-a-pulsar-could-explain-why-we-see-antimatter-coming-from-space/
This model shows Geminga's gamma halo over time. Two effects change its shape. The first is the pulsar's motion through space, the second is the energy level. At lower energy levels, the gamma

https://www.space.com/38796-earthbound-antimatter-mystery-pulsars-not-source.html
[Supernova Face-Off May Solve 40-Year-Old Antimatter Mystery] ... the direction of two nearby pulsars — Geminga and its companion PSR B0656+14 — that are the right age and distance from Earth

https://bigthink.com/starts-with-a-bang/antimatter-mystery-likely-due-to-pulsars-not-dark-matter/
For years, astronomers have been puzzled by an excess of antimatter particles. Unfortunately, dark matter is probably not the solution. When you look out at the Universe, what you see […]

https://www.planet-today.com/2019/12/the-strange-halo-of-nearby-pulsar-could.html
The pulsar is named Geminga, and it's one of the nearest pulsars to Earth, about 800 light-years away in the constellation Gemini. ... (NASA's Fermi Gamma-ray Space Telescope discovered it.) But it's large, covering as much of the sky as 40 full Moons. The halo might be responsible for some goings-on in our own neighborhood: there's an

https://ntrs.nasa.gov/search.jsp?R=19960016279
The pulsation of Geminga has been detected to date only at high energies (E greater than 0.1 keV). Since x-ray exposures are short and Geminga is at best only marginally detected in gamma-rays at E less than 30 MeV, the primary means of timing Geminga is with high-energy gamma-rays. The EGRET observations of Geminga now span 4 years. These data are analyzed to determine the 1995 ephemeris for

https://bigthink.com/starts-with-a-bang/pulsars-dark-matter-milky-way-antimatter/
The Crab pulsar, like all pulsars, is an example of a neutron star corpse. The gas and matter surrounding it is quite common, and is capable of providing fuel for the pulsing behavior of these

https://aasnova.org/2019/10/09/should-we-blame-pulsars-for-too-much-antimatter/
Clues from Gamma-rays. One of the leading theories is that the excess positrons are produced by nearby pulsars — rapidly rotating, magnetized neutron stars. We know that pulsars gradually spin slower and slower over time, losing power as they spew a stream of high-energy electrons and positrons into the surrounding interstellar medium.