Delaware-Size Iceberg Stuck Near Home, Satellite Images Show
Satellite images show Iceberg A-68A and its short journey from where it calved off the Larsen C ice shelf last year.
Credit: NASA Earth Observatory/Joshua Stevens, Landsat/U.S. Geological Survey

An enormous iceberg that split off the Larsen C ice shelf in Antarctica a year ago hasn't gone very far, as a new comparison of satellite images released by NASA shows.

In fact, the iceberg has traveled just 30 miles (47 kilometers) since its birth, which took place sometime between July 10 and July 12, 2017. Officially called Iceberg A-68A, it became one of the largest icebergs on record, and its size was widely compared to Delaware.

Scientists estimated that the iceberg weighs about a trillion tons, and that's part of why the iceberg hasn't gotten very far, all told. It has also gotten stuck in shallow water a couple times and gets waylaid by smaller chunks of sea ice that fill the ocean around Antarctica.

But the iceberg has moved farther than the before-and-after pictures alone would suggest. "Throughout the year, tide cycles have shuffled the berg back and forth like a driver trying to get out of a tight parallel-parking spot," NASA's statement notes.

The comparison images come from the Landsat 8 satellite, which has been in orbit and at work studying changes on Earth's surface since 2013. The satellite carries a thermal camera that gathers data about land-use changes by measuring the temperature of Earth's surface — like the temperature difference between an iceberg and the ocean water surrounding it.

In the images, yellow represents the warmest areas and white the coolest areas, with dark blue and purple areas at medium temperatures. The ocean water surrounding the iceberg appears as a thin line of purple dotted with orange around its white bulk.

But just because the iceberg has stayed close to home so far doesn't mean it will remain there — it just needs the right conditions to break free. When it does, Landsat will be overhead, ready to follow its journey.

Email Meghan Bartels at mbartels@space.com or follow her @meghanbartels. Follow us @Spacedotcom, Facebook and Google+. Original article on Space.com.