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

Scientists crunching data from NASA’s Cassini spacecraft believe Saturn’s moon Dione has a liquid ocean buried 60 miles under a thick icy shell, potentially adding to a growing list of ocean worlds in the frigid outer solar system.

United Launch Alliance has completed stacking of the major elements of the Atlas 5 rocket assigned to power NASA’s Perseverance rover toward Mars, but the mission’s launch date has been pushed back three days to July 20 after teams repaired an issue with a crane in the Atlas 5’s assembly building.

Chinese scientists and engineers are counting down to launch of a heavy-lift Long March 5 rocket Monday with the Chang’e 5 mission, an ambitious attempt to land on the moon, drill samples from beneath the lunar surface, and return the material to Earth.