Small satellites that have propulsion systems, but don’t have encrypted commanding systems, pose a small but real threat of being hacked and endangering other satellites, according to a new study.

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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...