and mysterious gamma radiation with an energy of 511 keV, possibly resulting from electron and positron annihilation. Dark matter is a mysterious form of matter that we cannot directly see as it ...

At one-one-thousandth of a second after the Big Bang, the great annihilation event should have wiped out all matter, leaving ...

At one-one-thousandth of a second after the Big Bang, the great annihilation event should have wiped out all matter, leaving a universe of only radiation. Why still don't know why any matter survived.