Rick Binzel had three key messages to convey to attendees at the start of a workshop held in April at a European Space Agency center in the Netherlands: “Apophis will miss the Earth. Apophis will miss the Earth. Apophis will miss the Earth.”

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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...