Q&A with Michel Denis, ExoMars flight director

A $150 million cost overrun and two-year launch delay for NASA’s InSight Mars mission could mean fewer opportunities for new planetary science missions in the next few years, but the head of the agency’s science division said this week NASA will still approve development of at least one new solar system probe in December.

A European Ariane 5 rocket fired into a gloomy sky Thursday over French Guiana and streaked into space from the tropical launch base with 2.9 million pounds of thrust from two solid rocket boosters and a hydrogen-fueled Vulcain 2 main engine.

A modified Russian missile built for nuclear war blasted off on a peaceful mission Friday, targeting placement of a European Earth observation satellite in orbit to measure atmospheric chemistry and global air quality. Liftoff from the Plesetsk Cosmodrome in northern Russia occurred at 0927 GMT (5:27 a.m. EDT).