Scientists now say an interstellar comet discovered earlier this month could be one of the oldest that astronomers have ever encountered.

A comet has entered the Solar System from interstellar space and will pass through the inner planets later this year, NASA says.

Astronomers have been given the rare opportunity to study an extrasolar object after the recent discovery of the interstellar comet 3I/ATLAS. Experts tell Live Science how they are planning to observe the cosmic visitor.