Under the original Artemis architecture, NASA planned on multiple versions of the SLS rocket, ranging from the "Block 1" vehicle currently in use to a more powerful EUS-equipped Block 1B and eventually an even bigger Block 2 model using advanced solid rocket boosters. The latter two versions required use of a taller mobile launch gantry, already well under construction at the Kennedy Space Center.
The RFU council will vote at Twickenham on proposals to ringfence the 10-team Prem with no promotion or relegation until 2030, when a staged expansion is planned, beginning with the addition of two more teams.
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