Rocket Lab, the U.S.-New Zealand company developing the Electron small launch vehicle, now plans to begin launches in the middle of this year after completing qualification tests of the vehicle’s main engine.

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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...