Crossword puzzle clue "dark matter"

Here are the possible solutions for dark matter clue

Answer
Clue
Relevancy
greeneggsandham
Clue
Source of "Say! In the dark? Here in the dark! Would you, could you, in the dark?"
age
Clue
"___ is an issue of mind over matter.If you don't mind, it doesn't matter." (Mark Twain)
Definition
to grow old
idea
Clue
Matter for the gray matter
Gray matter matter?
Gray matter matter
Definition
a conception or a plan
makeamentalnote
Clue
Put some matter in the gray matter?
astr
Clue
Dark matter sci.
axion
Clue
Hypothetical particle in cold dark matter
Definition
a hypothetical subatomic particle

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