UPDATE Oct 10: Firefly and York Space Systems announce MoU on future launch systems. Firefly's Alpha rocket could accommodate up to four of York's S-Class platform, 3-axis-stabiliized, up to 85 kg of payload, 100W average power.

PARIS — The next 18 months are “Prove It” time for launch-service startup Firefly Aerospace Inc. The company’s Alpha vehicle — 630 kilograms to a 500-kilometer sun-sun-synchronous orbit — is undergoing stage testing this year, with a first orbital flight scheduled for 2019, likely from Vandenberg Air Force . . .

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