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The physicists combined positrons and anti-protons beginning with 30,000 anti-protons cooled to 200 above absolute zero, or 200 kelvin, and two million positrons cooled to about 40 kelvin.
Researchers working on the experiment noted collisions of protons and anti-protons in the Tevatron.
Further study is motivated not only by fundamental interest but also because experiments may shed light on the physics of dense cores of gas giant planets like Jupiter, or guide efforts to create anti-hydrogen through the recombination of positrons and anti-protons.
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