Live coverage: Rosetta’s final hours

Rosetta flight director Andrea Accomazzo says the Philae lander is ready for a daring descent and touchdown Wednesday on comet 67P/Churyumov-Gerasimenko. The European craft is making the world’s first attempt to land on a comet.

Spaceflight Now’s Stephen Clark spoke with Rolf de Groot, head of ESA’s robotic exploration coordination office, on Sept. 25, discussing the two-month launch delay of Europe’s ExoMars orbiter and landing demonstrator set to depart for Mars in 2016 and the status of an ambitious rover mission in 2018.

Using precise autonomous navigation algorithms, NASA’s OSIRIS-REx spacecraft will descend to the surface of an asteroid next year, aiming to retrieve rock specimens for return to Earth from a gravelly pit flanked by hazardous boulders, scientists said Thursday.