Q&A with Steve Clarke, deputy associate administrator for exploration in NASA’s science division (members only)

Two U.S. Air Force cargo planes delivered the Mars 2020 rover, cruise stage, descent module and the Mars Helicopter to the Kennedy Space Center in Florida this week for final assembly, fueling and mounting atop a United Launch Alliance Atlas 5 rocket in preparation for liftoff in July.

Images taken by NASA’s New Horizons spacecraft when it flew by an object the size of a large metropolitan area at the frontier of the solar system Jan. 1 have revealed the miniature world has a more flattened shape than the flyby’s initial pictures suggested.

Four satellites set to join O3b’s expanding broadband network successfully launched Friday on top of a Russian-built Soyuz booster from French Guiana, joining 12 other craft linking developing nations, far-flung islands, cruise ships and other hard-to-reach locales with the Internet.