Video: Marc Buie, New Horizons Occultation Team Lead (members only)

Scientists say the touch and go landing by NASA’s OSIRIS-REx spacecraft on an asteroid last month revealed fresh insights into the structure of loose rocks that may cover the surfaces of many small planetary bodies — material that is more akin to a playground ball pit than solid bedrock.

The two missions will be launched within roughly three weeks of one another from New Zealand. Liftoff of the Electron rocket with the PREFIRE-1 satellite occurred at 7:41 p.m. NZST (3:41 a.m. EDT, 0741 UTC) on Saturday.

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.