The extent and speed of ice moving off the ice sheets of Greenland and Antarctica into the sea—an important dynamic for ...

After a 12-day crossing, and a hard slog through sea ice, the field work on this Antarctic expedition is ready to start.

On Saturday (Jan. 10), for example, we will see three satellites on one side of Jupiter (going outward from the planet: Ganymede, Io and Europa ), while the fourth ( Callisto) remains all by itself on ...