ANTARCTICA (CNN/NASA) — Scientists say a massive iceberg with an area almost twice the size of Atlanta is moving into the ocean off Antarctica.
It could threaten shipping during the Antarctic winter.
In a report from NASA’s Earth Observatory, scientists say the ice island covers 255 square miles and could be almost one-third of a mile thick.
NASA says the iceberg broke away from Antarctica’s Pine Island Glacier last November.
The crack that produced it was first spotted in 2011.