You are currently viewing the summary.
View Full TextLog in to view the full text
AAAS login provides access to Science for AAAS members, and access to other journals in the Science family to users who have purchased individual subscriptions.
More options
Download and print this article for your personal scholarly, research, and educational use.
Buy a single issue of Science for just $15 USD.
Summary
Two of NASA's boldest plans are getting contrasting messages. An agency science panel this week gave a strong endorsement to the idea of sending a new rover to Mars in 2020 that could cache samples for later return to Earth. But a proposal to capture a small asteroid and then land astronauts on it is attracting widespread criticism.
-
↵* With reporting by Richard Kerr.