Janus spacecraft illustration
NASA put the completed Janus spacecraft into long-term storage with the hopes of potentially flying them on a future mission. Credit: Lockheed Martin

WASHINGTON — Scientists are urging NASA to act quickly on concepts for repurposing a pair of NASA smallsats to visit an asteroid before it makes a very close approach to Earth in less than four years.

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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...