The ongoing investigation into the June 28 Falcon 9 launch failure has yet to find a cause for the accident based on the available data, SpaceX Chief Executive Elon Musk said July 7.

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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...