NASA has pushed back a widely anticipated decision on the design of its Asteroid Redirect Mission (ARM) until January as it seeks to understand if the technology offered by one option is worth its additional complexity and cost.

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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...