Star clusters could hold alien lifeforms

Globular clusters — dense balls of ancient stars at the outermost edge of the galaxy — may be the best places to look for alien civilisations, an expert has claimed.

For many reasons, the distant regions might be favourable locations for intelligent life, astrophysicist Dr Rosanne Di Stefano believes.

One is their age. Globular clusters contain stars estimated to be 10 billion years old — ample time for life to evolve to an advanced level.