What capability of liquid engines is invaluable for achieving precise orbital insertion?

Answer

The ability to be shut down completely and restarted later in flight

Liquid engines can be throttled, shut down, and restarted, which is crucial for complex missions requiring multiple burns or in-space trajectory adjustments that solid motors cannot perform.

What capability of liquid engines is invaluable for achieving precise orbital insertion?

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Rocket Science for Everyone with Yale's Marla Geha - YouTube

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