2. Antimatter
Found Year: 1928
Its Discoverer: Paul Dirac
Place: Collisions between cosmic rays
Since the discovery of antimatter as a hypothesis a century ago, research has continued to uncover additional details about this extraordinary material. Matter made up of the opposite particles of regular matter is called antimatter. At $2,700 trillion per gramme, antimatter is the most expensive material on Earth.
NASA/MSFC/Wikimedia antimatter
Since virtually none of it remains in space anymore, antimatter is likewise scarce there. Matter and antimatter are destroyed when they come into touch with one another, leaving only pure energy. The process happens naturally, albeit infrequently, in space during collisions with cosmic rays. In addition to learning more about antimatter, scientists are also interested in the strange disappearance of this material from space.
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