Polar Star it’s not the largest or most powerful ice breaker (like Russia’s nuclear-powered NS Yamal), but with its 75,000 horsepower can crush a two story ice wall.
The 52 passangers from the Akademik Shokalskiy, the ship that had been trapped in Antarctic ice for nearly 10 days, have now been rescued. Image © Andrew Peacock
Lenticular clouds are a type of wave cloud. They usually form when a layer of air near the surface encounters a topographic barrier, gets pushed upward, and flows over it as a series of atmospheric gravity waves. Image © Michael Studinger. Caption by Adam Voiland