A NEWLY created form of antimatter is the heaviest and most complex anti-thing ever seen. Anti-helium nuclei, each containing two antiprotons and two antineutrons, have been created and detected at the Relativistic Heavy Ion Collider (RHIC) in Upton, New York.
Antiparticles have the opposite electrical charge to ordinary matter particles. So antiprotons have negative charge, while antineutrons, which are electrically neutral, are made up of antiquarks that have the opposite charge to their normal quark counterparts.
Antimatter annihilates on contact with matter, making it notoriously tricky to find and work with. Until recently, the most complex unit ever seen was…
