Q&A with Earl Maize, Cassini project manager (members only)

Europe’s ExoMars Trace Gas Orbiter and Schiaparelli lander arrived at Mars Wednesday, with the orbiter safely captured by Martian gravity after a critical engine firing. The lander’s fate is unknown after mission control lost contact just before touchdown.

A NASA post advertising an opening for a new Planetary Protection Officer provided a field day for headline writers who apparently couldn’t resist having a bit of fun at the agency’s expense by suggesting, in large type, that whoever filled the post would be defending Earth from aliens. And making good money to boot.

Three years and a billion miles past Pluto, NASA’s New Horizons probe is on the verge of at least one more pioneering, once-in-a-lifetime milestone: a New Year’s Day flyby of a small body known as 2014 MU69, unofficially dubbed Ultima Thule — “beyond the known world” — in a NASA naming contest.