Crossword puzzle clue "antiparticle first observed in 1929"

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Here are the possible solutions for antiparticle first observed in 1929 clue

Answer
Clue
Relevancy
positron
Clue
Antiparticle first observed in 1929
Definition
an electron but with a positive charge, also POSITON
eta
Clue
___ meson (particle that is its own antiparticle)
Definition
a Greek letter
photon
Clue
Particle that is its own antiparticle
Definition
a quantum of light or other electromagnetic radiation
ceres
Clue
First observed asteroid
Definition
CERE, to wrap in a waxy cloth
mtsinai
Clue
Where the law was first observed
neptune
Clue
It was first observed in 1846
pavlov
Clue
Russian physiologist who first observed "conditioned responses"
thanksgiving
Clue
National day of gratitude, first observed by the Pilgrims in 1621

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