`` Antihydrogen '' can also refer to the molecule called Antihydrogen , which is made of two bonded antiprotons . Recent data released by CERN states that , when fully operational , their facilities are capable of producing antiprotons per minute . Assuming a 100 % conversion of antiprotons to antihydrogen , it would take 100 billion years to produce 1 gram or 1 mole of antihydrogen ( ( ( Avogadro constant ) ) atoms of antihydrogen ) .