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street party kicks off its final day at the notting hill carnival in west london. nasa has cancelled today s launch of its most powerful rocket, artemis one, which had been due to take off for an uncrewed test flight to the moon. the us space agency said one of its engines had developed a bleed that couldn t be fixed in time; the next possible launch date is friday the second of september. the artemis programme aims to return humans to the moon. if successful, the plan is for astronauts to be on board the flight in two years time. our science correspondent, jonathan amos told us what went wrong. frustrating day today, ben, it really was. we had a number of little issues that cropped up. first of all, when we got here, it was pouring with rain and that delayed them tanking, putting all the propellants that they needed to go in this monster rocket over my shoulder. then they thought they had a crack halfway up the rocket, believe it or not, and decided that that was just frosti

Apollo missionGlobal appealforSpace rocketLiz trussEnergy costsInstitute for fiscal studies30 millionA thousandGreat britainStreet partyNotting hill carnivalWest londonArtemis oneSpace agencyCouldn tJonathan amos