The launch of Nasa's most-powerful ever rocket has been delayed due to a tropical storm which could become a hurricane.

Artemis I Moon rocket was expected to launch from the Kennedy Space Center, in Florida, on Tuesday.

The launch of the rocket had already been postponed twice.

The Space Launch System (SLS) vehicle is designed to send astronauts and their equipment back to the Moon after an absence of 50 years.

A guide to Nasa's mega Moon rocket.

The space agency wants to send the unmanned capsule Orion around the back of the Moon, ahead of journeys with humans aboard.

As it happened: Nasa cancels Moon rocket launch because of engine problem.