Scientists said they are thrilled with an initial assessment of asteroid samples returned by a NASA spacecraft last month even though they still don’t know how much material that mission brought back to Earth.

This post is only available to members.

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...