As far as gravity is concerned, both matter and its charge-flipped 'mirror' twin, antimatter, deserve a big, warm hug.
A recent experiment by international Antihydrogen Laser Physics Apparatus collaboration achieved the first direct measurement of free-falling antimatter.
Had the results been any different, we might have at last had our first solid clue on where half of the Universe went some 13.4 billion years ago. Antimatter is the quantum shadow of the familiar kind of matter that makes up objects in our everyday lives. Reverse the charge of an electron, you get an equally tiny, yet positively charged particle called a positron.And if you put the two together? You get an atom ofantimatter particles, at least no more than it is in creating matter. But bring the two together and their opposing flavors will quickly cancel out, leaving nothing but a rapidly expanding bubble of gamma rays to suggest they ever existed.
This blunt fact of cosmic bookkeeping poses a mystery – why do we have a Universe filled with matter-stars, matter-planets, and matter-galaxies, if an equivalent amount of antimatter appeared in the raging furnace of thepremises of antimatter creationFor example, if positrons were pushed away by gravity rather than pulled, the two kinds of matter could have been divided early in the Universe's creation.
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