A NASA spacecraft entered orbit around Mars as planned late Sept. 21, the first of two spacecraft scheduled to arrive at the planet in a three-day period.

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...