As Rocket Lab prepares to begin tests of the first Archimedes engine for its Neutron launch vehicle, the company says that the rocket won’t be ready for its first flight before the middle of 2025.

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Jeff Foust has more than a decade of experience writing about space policy, entrepreneurial ventures and regulatory affairs. In 2001, he established spacetoday.net to aggregate and summarize the day's space-related news stories. In 2003, he started The...