Crossword puzzle clue "particle theorized in 1977"

Here are the possible solutions for particle theorized in 1977 clue

Answer
Clue
Relevancy
axion
Clue
Particle theorized in 1977
Definition
a hypothetical subatomic particle
photon
Clue
Particle theorized by Einstein
Definition
a quantum of light or other electromagnetic radiation
atoms
Clue
Units first theorized by the Greeks
John Dalton theorized on them
Definition
ATOM, the smallest particle in an element which can take part in a chemical reaction
bern
Clue
Swiss city where Einstein theorized relativity
contractor
Clue
Type of worker theorized to have built the Death Star, according to a "Clerks" bit
Definition
one that contracts to perform work or provide supplies
immanuel
Clue
Kant who theorized that the human mind actively structures its experience of the world rather than just passively receiving it (did I get that right?)
lifeonearth
Clue
Theorized result of comet bombardment

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