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

An Ariane 5 rocket took off from French Guiana Friday with the heaviest interplanetary science probe ever launched, kicking off a $1.7 billion European Space Agency mission on a decade-long quest to Jupiter’s icy moons in search of environments that could be habitable for life.

SpaceX has filed a protest challenging a nearly $150 million NASA contract awarded to United Launch Alliance last month to send a robotic asteroid probe into space.

The sampling mechanism on NASA’s OSIRIS-REx spacecraft is stuffed with specimens captured from asteroid Bennu earlier this week — so full that some of the rocks are floating out into space. Officials said Friday they will stow the samples inside the mission’s Earth return capsule sooner than planned to minimize the loss of asteroid material.