When matter and antimatter particles combine, the two particles annihilate each other and convert their mass into energy in the form of two gamma rays.
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Q2: The decoupling of the strong force from
Q3: The Universe has_.
A) an edge, does not
Q4: The big bang happened everywhere in the
Q5: Dark energy accounts for about 70% of
Q6: Olber's paradox is explained by the fact
Q8: Tiny amounts of lithium and beryllium were
Q9: The proper interpretation of the Hubble law
Q10: The Hubble time is_.
A) an estimate of
Q11: The "big bang" was an explosion of
Q12: The expansion of the Universe is accelerating.
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