Lockheed Martin Rocket Lab Electron launch
An illustration of a Lockheed Martin-provided launch vehicle, a version of Rocket Lab's Electron, lifting off from the U.K.'s proposed spaceport in Sutherland, Scotland.

While Lockheed Martin continues to suggest it will use Rocket Lab’s Electron rocket at a Scottish launch site announced at the beginning of this week, company officials said July 17 they have yet to formally select a vehicle to fly at the site.

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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...