Transcripts of Fermi_Geminga_Halo

[00:00:00.00] (Music throughout)
[00:00:06.00] This pulsar’s vast gamma-ray halo may explain a key observation about antimatter near Earth.
[00:00:14.00] [Big Dipper to scale]
[00:00:21.00] Pulsars are rapidly spinning neutron stars, the superdense remnants of supernovae explosions.
[00:00:33.00] NASA’s Fermi mission has observed one nearby pulsar, Geminga, for more than 10 years.
[00:00:43.00] The data are now so detailed that when scientists remove background sources…
[00:00:50.00] …Geminga’s faint but huge gamma-ray halo emerges.
[00:00:58.00] This halo precisely matches computer models that account for positron production.
[00:01:07.00] Positrons are antimatter versions of electrons. They’re found near Earth but have no clear origin.
[00:01:17.00] Scientists suspected pulsars to be positron sources. This study confirms it.
[00:01:25.00] As it turns out, Geminga is likely the greatest positron source for Earth.
[00:01:33.00] It alone could produce 20% of the positrons at an energy of 1 TeV seen in orbit.
[00:01:41.00] So pulsars not only shine in the highest-energy light, they also glow in antimatter.
[00:01:53.00] [Explore, Solar System & Beyond]
[00:01:58.00] [NASA]