1.   These are ordinary atoms in which the outermost electron has been promoted to an immensely large orbit.

2.   Ordinary atoms are made up of a number of electron particles in orbit around a nucleus.

3.   But he said further research was needed to observe the antimatter atoms at slower speed and compare them with ordinary atoms.

4.   So the wave behaviour of cold atoms is easier to observe than that of ordinary atoms.

5.   The next step for Oelert and his team is to compare the atoms of antimatter with ordinary atoms.