A trick of the light?

Sir, – In response to Margaret Moore’s question of September 29th, the appropriate term for particles that travel faster than…

Sir, – In response to Margaret Moore’s question of September 29th, the appropriate term for particles that travel faster than light is “superluminal”. – Yours, etc,

COLM KELLEHER,

PhD candidate in physics,

New York University,

Washington Square,

New York City.

Sir, – The answer to Margaret Moore’s query on what word to use for going faster than the speed of light is surely self-evident – supercalifragilisticexpialidocious. – Yours, etc,

JOHN RISELEY,

Coundon Court,

Killiney, Co Dublin.