Guar gum, a plant colloid, costs less than agar and is better suited for growing thermophilic bacteria, but is also more difficult to handle, being more viscous and less transparent. The bacterial polysaccharide xanthan is cheaper as well but forms weaker jellies that, as with carrageenan, might result in puncturing its surface. Other colloids, like alginate (from brown seaweed) and gellan gum (from a bacterium), don’t set solely based on temperature and require additives for gelation. These additives might interfere with microbial growth and make the preparation of those jellies less handy than agar plates.
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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.
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