Will there be a block 1 launch?

Credit: NASA CINCINNATI — With two more launches of the Block 1 version of the Space Launch System now planned, NASA is starting work to procure and human-rate additional upper stages. NASA originally expected to fly the Block 1 version of the SLS only once before moving to the more powerful Block 1B version of the rocket.

What is a Block 1B crew vehicle?

Block 1B crew vehicle will use a new, more powerful Exploration Upper Stage (EUS) to enable more ambitious missions. The Block 1B vehicle can, in a single launch, carry the Orion crew vehicle along with large cargos for exploration systems needed to support a sustained presence on the Moon.

Will NASA use Block 1B more than once?

The Block 1B will replace the ICPS with the Exploration Upper Stage, a larger upper stage under development. However, with funding from Congress provided in the fiscal year 2018 omnibus appropriations bill to build a second mobile launch platform, NASA now expects to use the Block 1 version more than once.