The gate interface mentioned in the gate chapter. Is it a physical thing gatecrashers have to attach or software they use to interpret the symbols on the "growth"?
Mention of no sentient life found, what about non sentient? Lot's of precautions taken when new gate is opened. Has anything dangerous come through in the past? Threats on exoplanets? Have to wait for gatecrashing book?
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"The difference between truth and fiction, people expect fiction to make sense."