Just as it's possible to squeeze out a fine mist of antimatter using particle colliders here on Earth, nature continues to shed antiprotons and antineutrons in cataclysmic high-energy events.

However, this raises another question. Antielectrons, antiprotons and antineutrons should be able to combine to make whole antiatoms, and indeed antiplanets and antigalaxies. What's more ...

Composed of four antimatter particles -- an antiproton, two antineutrons, and one antihyperon -- these exotic antinuclei are known as antihyperhydrogen-4. Scientists studying the tracks of ...

It's antihelium-4, a conglomeration of two antiprotons and two antineutrons. This antihelium is the antimatter partner to what physicists call the alpha particle (identical to a standard helium ...

There are also neutral antineutrons. And if any of these particles touch their antiparticles—if, say, an electron touches a positron—they annihilate each other in bursts of energy ...