Mars 2020 encapsulation
NASA's Mars 2020 spacecraft (center) shortly before the spacecraft was encapsulated within the Atlas 5 payload fairing in June. NASA/Christian Mangano

The launch of NASA’s next Mars rover mission has been delayed to no earlier than July 30 because of a launch vehicle processing issue, the latest in a series of slips that have now used up nearly half of the available launch opportunities for the mission.

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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...