He became well known for his work on long-period variable stars and frequently collaborated with professor Sir Arthur Eddington throughout his life. Plakidis became a well-known astronomer and continued his work in the field of observational astrophysics.
Plakidis was recognized for his work on long-period variable stars, often working closely with Professor Sir Arthur Eddington. He later established himself as an accomplished astronomer who focused on observational astrophysics.